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Rockport, Essex Co., Massachusetts, USAi
Regional Level Types
Rockport- not defined -
Essex Co.County
MassachusettsState
USACountry

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Key
Latitude & Longitude (WGS84):
42° 39' 20'' North , 70° 37' 13'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Rockport4,966 (2017)0.0km
Gloucester29,781 (2017)5.6km
Essex1,471 (2017)13.5km
Manchester-by-the-Sea5,366 (2017)14.9km
Ipswich4,222 (2017)18.2km


The town of Rockport was separated from Gloucester and incorporated in 1840. Granite was quarried here beginning in 1823. Interesting minerals occur in granite quarries and other bedrock exposures of alkaline Cape Ann granite and associated pegmatites and miarolitic cavities.

McKinstry (1921) described some of the town's mineralogical highlights: "More than fifty years ago attention was called to the unusual mineral occurrences at Rockport, on Cape Ann, by J. P. Cooke's description of danalite, a new beryllium mineral, and subsequently of cryophyllite, a new lithium mica. Besides being the type locality for these species, the Rockport quarries have afforded an interesting list of rare-earth minerals, and, perhaps most unusual of all, large tabular crystals of fayalite, normally an utter stranger to granitic rocks."

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

29 valid minerals. 2 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Description: Reported from pegmatite in alkalic granite. Likely a sodic amphibole or aegirine.
Reference: Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County
Albite
Formula: Na(AlSi3O8)
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
'Albite-Anorthite Series'
Reference: Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI (USGS Bulletin 354).
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Annite (TL)
Formula: KFe2+3(AlSi3O10)(OH)2
Type Locality:
Reference: Dana (1868), A System of Mineralogy, 5th edition; Dyar, M. Darby and Burns, Roger G. (1986): Miissbauer spectral study of ferruginous one-layer trioctahedral micas (American Mineralogist, Volume 71, pages 955-965).
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Astrophyllite
Formula: K2NaFe2+7Ti2Si8O26(OH)4F
Reference: Sears, J. H. (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County, p. 241.; Toulmin, Priestley, 1957, v. 42, p.912-915.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI (USGS Bulletin 354).
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
Calcite
Formula: CaCO3
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
'Chlorite Group'
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
'Cryophyllite'
Description: A discredited mineral.
Reference: Parsons, J.: On Cryophyllite. Am. Jour. Sci. (2), xliii, 217. (1867); Sears, J. H.(1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.
Danalite (TL)
Formula: Be3Fe2+4(SiO4)3S
Reference: Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Yale Peabody Museum no. 777; Sears, J. H.(1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.
Fayalite
Formula: Fe2+2SiO4
Reference: Palache, Charles (1950): Fayalite at Rockport, Massachusetts. (American Mineralogist 35:877)
'Fergusonite'
Reference: Yale Peabody Museum no. 161 and 1674; Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World; Sears, J. H.(1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.
Fergusonite-(Y)
Formula: YNbO4
Reference: www.handbookofmineralogy.org/pdfs/fergusonitey.pdf
Ferro-anthophyllite
Formula: ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Reference: www.agu.org/cgi-bin/wais?l=V21B-01; Bozhilov, K. N. & Evans, B. W., 2001. Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study.(AmMin 86(10):1252-1260.)
Fluorite
Formula: CaF2
Fluorite var: Yttrocerite
Formula: (Ca,Y,Ce)F2+x
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
'Gadolinite' ?
Description: Unconfirmed. Collected 1920. ID based on resemblence to gadolinite from Texas, though a qualitative analysis is lacking (McKinstry, 1921: Minerals of Rockport, Mass; AmMin 6:59).
Reference: Harvard Mineralogical Museum #110632
Galena
Formula: PbS
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
Genthelvite
Formula: Be3Zn4(SiO4)3S
Reference: Dunn, P. (1976): Genthelvite and the helvine group (Mineralogical Magazine 40:627-636).
Grunerite
Formula: ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Reference: Bozhilov, K. N. & Evans, B. W., 2001. Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study.(AmMin 86(10):1252-1260.); Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
Hastingsite
Formula: {Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
Description: Chemical analysis (Lyons, 1976) identified some of the Cape Ann granite amphiboles as "ferrohastingsite" (since redefined as hastingsite.)
Reference: Lyons, Paul, 1976. The Chemistry of Riebeckites of Massachusetts (MINERALOGICAL MAGAZINE 4:473-9).
Hedenbergite
Formula: CaFe2+Si2O6
Hematite
Formula: Fe2O3
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
'Hornblende'
Reference: Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI (USGS Bulletin 354).
Ilmenite
Formula: Fe2+TiO3
Reference: Palache, Charles (1950): Fayalite at Rockport, Massachusetts. (American Mineralogist 35:877-881).
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI (USGS Bulletin 354).
Magnetite
Formula: Fe2+Fe3+2O4
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
Microcline
Formula: K(AlSi3O8)
Reference: No reference listed
Microcline var: Amazonite
Formula: K(AlSi3O8)
Reference: Sears, J. H.(1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.
Minnesotaite
Formula: Fe2+3Si4O10(OH)2
Reference: Bozhilov, K. N. & B. W. Evans (2001): Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study. (American Mineralogist 86(10):1252-1260)
Molybdenite
Formula: MoS2
Reference: Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: No reference listed
Orthoclase
Formula: K(AlSi3O8)
'Polymignite'
Formula: (Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Reference: Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
Pyrite
Formula: FeS2
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
Pyrrhotite
Formula: Fe7S8
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
Quartz
Formula: SiO2
Reference: No reference listed
Quartz var: Blue Quartz
Formula: SiO2
Reference: Palache, 1950. Fayalite at Rockport, Massachusetts. AmMin 35:877-881
Quartz var: Citrine
Formula: SiO2
Reference: ; Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County
Quartz var: Rock Crystal
Formula: SiO2
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Sears, J. H.(1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County, p. 237.
'Tantalite'
Formula: (Mn,Fe)(Ta,Nb)2O6
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
Thorite
Formula: Th(SiO4)
Thorite var: Orangite
Formula: Th(SiO4)
Reference: McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).
Zircon
Formula: Zr(SiO4)
Reference: No reference listed
Zircon var: Cyrtolite
Formula: Zr[(SiO4),(OH)4]
Reference: Knowlton, W. (1867). On a new mineral from Rockport, Mass. in Am. Jour. Sci., 2nd Series, vol. XLIV, no. 131, pp 224-226,
Zirconolite
Formula: CaZrTi2O7
Reference: Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
'Zirconolite-3O'
Formula: (Ca,REE)2Zr2(Ti,Nb)3FeO14
Reference: Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 3 - Halides
Fluorite3.AB.25CaF2
var: Yttrocerite3.AB.25(Ca,Y,Ce)F2+x
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
var: Blue Quartz4.DA.05SiO2
var: Citrine4.DA.05SiO2
var: Rock Crystal4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Zirconolite4.DH.30CaZrTi2O7
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Fergusonite-(Y)7.GA.05YNbO4
Group 9 - Silicates
Actinolite ?9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
Annite (TL)9.EC.20KFe2+3(AlSi3O10)(OH)2
Astrophyllite9.DC.05K2NaFe2+7Ti2Si8O26(OH)4F
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Danalite (TL)9.FB.10Be3Fe2+4(SiO4)3S
Fayalite9.AC.05Fe2+2SiO4
Ferro-anthophyllite9.DD.05☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Genthelvite9.FB.10Be3Zn4(SiO4)3S
Grunerite9.DE.05☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Hastingsite9.DE.15{Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
Hedenbergite9.DA.15CaFe2+Si2O6
Microcline9.FA.30K(AlSi3O8)
var: Amazonite9.FA.30K(AlSi3O8)
Minnesotaite9.EC.05Fe2+3Si4O10(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Thorite9.AD.30Th(SiO4)
var: Orangite9.AD.30Th(SiO4)
Zircon9.AD.30Zr(SiO4)
var: Cyrtolite9.AD.30Zr[(SiO4),(OH)4]
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Chlorite Group'-
'Cryophyllite'-
'Fergusonite'-
'Gadolinite' ?-
'Hornblende'-
'Limonite'-(Fe,O,OH,H2O)
'Polymignite'-(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
'Zirconolite-3O'-(Ca,REE)2Zr2(Ti,Nb)3FeO14

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Fergusonite-(Y)8.1.1.1YNbO4
A2B2O6(O,OH,F)
Zirconolite8.2.5.5CaZrTi2O7
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Fayalite51.3.1.1Fe2+2SiO4
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Zircon51.5.2.1Zr(SiO4)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Hedenbergite65.1.3a.2CaFe2+Si2O6
Group 69 - INOSILICATES Chains with Side Branches or Loops
Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
Astrophyllite69.1.1.1K2NaFe2+7Ti2Si8O26(OH)4F
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Annite (TL)71.2.2b.3KFe2+3(AlSi3O10)(OH)2
Minnesotaite71.2.1.5Fe2+3Si4O10(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Al-Si Framework Feldspathoids and related species
Danalite (TL)76.2.4.2Be3Fe2+4(SiO4)3S
Genthelvite76.2.4.3Be3Zn4(SiO4)3S
Unclassified Minerals, Mixtures, etc.
Actinolite ?-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Albite-Anorthite Series'-
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Chlorite Group'-
'Cryophyllite'-
'Fergusonite'-
Ferro-anthophyllite-☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Fluorite
var: Yttrocerite
-(Ca,Y,Ce)F2+x
'Gadolinite' ?-
Grunerite-☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Hastingsite-{Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
'Hornblende'-
'Limonite'-(Fe,O,OH,H2O)
Microcline
var: Amazonite
-K(AlSi3O8)
'Polymignite'-(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Quartz
var: Blue Quartz
-SiO2
var: Citrine-SiO2
var: Rock Crystal-SiO2
var: Smoky Quartz-SiO2
'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
Thorite
var: Orangite
-Th(SiO4)
Zircon
var: Cyrtolite
-Zr[(SiO4),(OH)4]
'Zirconolite-3O'-(Ca,REE)2Zr2(Ti,Nb)3FeO14

List of minerals for each chemical element

HHydrogen
H AnniteKFe32+(AlSi3O10)(OH)2
H Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
H MuscoviteKAl2(AlSi3O10)(OH)2
H Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
H Ferro-anthophyllite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
H Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
H MinnesotaiteFe32+Si4O10(OH)2
H ApatiteCa5(PO4)3(Cl/F/OH)
H Limonite(Fe,O,OH,H2O)
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
BeBeryllium
Be DanaliteBe3Fe42+(SiO4)3S
Be GenthelviteBe3Zn4(SiO4)3S
CCarbon
C CalciteCaCO3
OOxygen
O AnniteKFe32+(AlSi3O10)(OH)2
O DanaliteBe3Fe42+(SiO4)3S
O Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
O QuartzSiO2
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O ZirconZr(SiO4)
O Microcline (var: Amazonite)K(AlSi3O8)
O Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
O Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Quartz (var: Citrine)SiO2
O Quartz (var: Rock Crystal)SiO2
O FayaliteFe22+SiO4
O Quartz (var: Smoky Quartz)SiO2
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
O OrthoclaseK(AlSi3O8)
O Ferro-anthophyllite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
O ThoriteTh(SiO4)
O Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
O Quartz (var: Blue Quartz)SiO2
O IlmeniteFe2+TiO3
O HedenbergiteCaFe2+Si2O6
O CalciteCaCO3
O MagnetiteFe2+Fe23+O4
O AlbiteNa(AlSi3O8)
O HematiteFe2O3
O Tantalite(Mn,Fe)(Ta,Nb)2O6
O Thorite (var: Orangite)Th(SiO4)
O GenthelviteBe3Zn4(SiO4)3S
O Fergusonite-(Y)YNbO4
O MinnesotaiteFe32+Si4O10(OH)2
O ApatiteCa5(PO4)3(Cl/F/OH)
O Limonite(Fe,O,OH,H2O)
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O ZirconoliteCaZrTi2O7
O Zirconolite-3O(Ca,REE)2Zr2(Ti,Nb)3FeO14
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F FluoriteCaF2
F AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
F Fluorite (var: Yttrocerite)(Ca,Y,Ce)F2+x
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Na Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
AlAluminium
Al AnniteKFe32+(AlSi3O10)(OH)2
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Microcline (var: Amazonite)K(AlSi3O8)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al OrthoclaseK(AlSi3O8)
Al Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Al AlbiteNa(AlSi3O8)
SiSilicon
Si AnniteKFe32+(AlSi3O10)(OH)2
Si DanaliteBe3Fe42+(SiO4)3S
Si Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si ZirconZr(SiO4)
Si Microcline (var: Amazonite)K(AlSi3O8)
Si Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si Quartz (var: Citrine)SiO2
Si Quartz (var: Rock Crystal)SiO2
Si FayaliteFe22+SiO4
Si Quartz (var: Smoky Quartz)SiO2
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Si OrthoclaseK(AlSi3O8)
Si Ferro-anthophyllite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Si ThoriteTh(SiO4)
Si Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Si Quartz (var: Blue Quartz)SiO2
Si HedenbergiteCaFe2+Si2O6
Si AlbiteNa(AlSi3O8)
Si Thorite (var: Orangite)Th(SiO4)
Si GenthelviteBe3Zn4(SiO4)3S
Si MinnesotaiteFe32+Si4O10(OH)2
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
S DanaliteBe3Fe42+(SiO4)3S
S MolybdeniteMoS2
S GalenaPbS
S PyriteFeS2
S PyrrhotiteFe7S8
S GenthelviteBe3Zn4(SiO4)3S
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K AnniteKFe32+(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
K Microcline (var: Amazonite)K(AlSi3O8)
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Ca FluoriteCaF2
Ca Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Ca HedenbergiteCaFe2+Si2O6
Ca CalciteCaCO3
Ca Fluorite (var: Yttrocerite)(Ca,Y,Ce)F2+x
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca ZirconoliteCaZrTi2O7
Ca Zirconolite-3O(Ca,REE)2Zr2(Ti,Nb)3FeO14
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
TiTitanium
Ti Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Ti AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Ti IlmeniteFe2+TiO3
Ti ZirconoliteCaZrTi2O7
Ti Zirconolite-3O(Ca,REE)2Zr2(Ti,Nb)3FeO14
MnManganese
Mn Tantalite(Mn,Fe)(Ta,Nb)2O6
FeIron
Fe AnniteKFe32+(AlSi3O10)(OH)2
Fe DanaliteBe3Fe42+(SiO4)3S
Fe Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Fe Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe FayaliteFe22+SiO4
Fe AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Fe Ferro-anthophyllite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Fe Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Fe IlmeniteFe2+TiO3
Fe HedenbergiteCaFe2+Si2O6
Fe MagnetiteFe2+Fe23+O4
Fe HematiteFe2O3
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe Tantalite(Mn,Fe)(Ta,Nb)2O6
Fe MinnesotaiteFe32+Si4O10(OH)2
Fe Limonite(Fe,O,OH,H2O)
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe Zirconolite-3O(Ca,REE)2Zr2(Ti,Nb)3FeO14
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
ZnZinc
Zn GenthelviteBe3Zn4(SiO4)3S
YYttrium
Y Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Y Fluorite (var: Yttrocerite)(Ca,Y,Ce)F2+x
Y Fergusonite-(Y)YNbO4
ZrZirconium
Zr Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Zr ZirconZr(SiO4)
Zr Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Zr ZirconoliteCaZrTi2O7
Zr Zirconolite-3O(Ca,REE)2Zr2(Ti,Nb)3FeO14
NbNiobium
Nb Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Nb Tantalite(Mn,Fe)(Ta,Nb)2O6
Nb Fergusonite-(Y)YNbO4
Nb Zirconolite-3O(Ca,REE)2Zr2(Ti,Nb)3FeO14
MoMolybdenum
Mo MolybdeniteMoS2
CeCerium
Ce Fluorite (var: Yttrocerite)(Ca,Y,Ce)F2+x
TaTantalum
Ta Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Ta Tantalite(Mn,Fe)(Ta,Nb)2O6
PbLead
Pb GalenaPbS
ThThorium
Th Polymignite(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Th ThoriteTh(SiO4)
Th Thorite (var: Orangite)Th(SiO4)

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Cooke, Josiah P., Jr. (1866): On Danalite, a new Mineral Species from the Granite of Rockport, Massachusetts, American Journal of Science and Arts: 47: 73-78.
Cooke, Josiah P., Jr. (1867): On Cryophyllite, American Journal of Science and Arts: 48: 217.
Knowlton, W. J. (1867). On a new mineral from Rockport, Massachusetts [Cyrtolite], American Journal of Science and Arts, 2nd Series, 44: 224-226.
Shaler, N. S. (1888): The Geology of Cape Ann, Massachusetts, USGS Ninth Annual Report.
Merrill, George P. (1889): The Collection of Building and Ornamental Stones in the U.S. National Museum, p. 287.
Warren, Charles H. (1903) Anthophyllite [= Ferro-anthophyllite] and Fayalite from Rockport, Massachusetts, American Journal of Science, 4th series: 16: 337.
Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.
McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts, American Mineralogist: 6: 56-60.
Palache, Charles (1950): Fayalite at Rockport, Massachusetts, American Mineralogist: 35: 877-881.
Dunn, P. (1976): Genthelvite and the helvine group, Mineralogical Magazine: 40: 627-636.
Lyons, Paul (1976): The Chemistry of Riebeckites of Massachusetts, Mineralogical Magazine: 4: 473-479.
Bozhilov, K. N. & B. W. Evans (2001): Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study, American Mineralogist: 86(10): 1252-1260.

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