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Dennis Hill locality (Litchfield sodalite locality), Litchfield, Kennebec Co., Maine, USAi
Regional Level Types
Dennis Hill locality (Litchfield sodalite locality)- not defined -
Litchfield- not defined -
Kennebec Co.County
MaineState
USACountry

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Key
Latitude & Longitude (WGS84):
44° 12' 29'' North , 69° 55' 0'' West
Latitude & Longitude (decimal):
Age:
239 ± 1 Ma
Geologic Time:
Dating method:
biotite 40Ar/39Ar age
Reference for age:
West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Nearest Settlements:
PlacePopulationDistance
Monmouth3,935 (2017)10.1km
Gardiner5,597 (2017)11.5km
Winthrop2,650 (2017)11.8km
Randolph1,772 (2017)12.2km
Farmingdale1,970 (2017)12.2km


Nepheline-syenite deposit. Also known as Litchfield Sodalite Locality. The locality was discovered at least by 1845 and chemical analyses of the mineral were published by Charles Jackson although he confused which minerals were reported. This is the locality for historical specimens of cancrinite and sodalite from Litchfield. It is also the type locality for hydronephelite, also called "white sodalite", now known as a mixture. Most of the specimens are found in float boulders and not in place. Finds extend into West Gardiner.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


17 valid minerals.

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!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, volume 1.; West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Albite
Formula: Na(AlSi3O8)
Reference: West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Albite var: Peristerite
Formula: Na(AlSi3O8)
Reference: Doug Watts
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Astrophyllite
Formula: K2NaFe2+7Ti2Si8O26(OH)4F
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: No reference listed
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Frank W. Clarke
Cancrinite
Formula: (Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Reference: West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Corundum
Formula: Al2O3
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Diaspore
Formula: AlO(OH)
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Fluorapatite
Formula: Ca5(PO4)3F
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Gibbsite
Formula: Al(OH)3
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
'Hydronephelite'
Description: Dennis Hill is the type locality for this mineral, but it has been shown to be a mixture of gibbsite, natrolite, and diaspore. Hydronephelite was once called "white sodalite" as it formed a rim on normal blue sodalite.
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
'Lepidomelane'
Reference: West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.
Nepheline
Formula: Na3K(Al4Si4O16)
Reference: West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Nepheline var: Eleolite
Formula: (Na,K)AlSiO4
Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
Reference: West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Sodalite
Formula: Na8(Al6Si6O24)Cl2
Reference: West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.
Zircon
Formula: Zr(SiO4)
Reference: King, V. and Foord, E., 1994, Mineralogy of Maine, v.1.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
Diaspore4.FD.10AlO(OH)
Gibbsite4.FE.10Al(OH)3
Magnetite4.BB.05Fe2+Fe3+2O4
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Aegirine9.DA.25NaFe3+Si2O6
Aegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
Albite9.FA.35Na(AlSi3O8)
var: Peristerite9.FA.35Na(AlSi3O8)
Annite9.EC.20KFe2+3(AlSi3O10)(OH)2
Astrophyllite9.DC.05K2NaFe2+7Ti2Si8O26(OH)4F
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Cancrinite9.FB.05(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Nepheline9.FA.05Na3K(Al4Si4O16)
var: Eleolite9.FA.05(Na,K)AlSiO4
Riebeckite9.DE.25◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
Sodalite9.FB.10Na8(Al6Si6O24)Cl2
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Hydronephelite'-
'Lepidomelane'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Diaspore6.1.1.1AlO(OH)
X(OH)3
Gibbsite6.3.1.1Al(OH)3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6
Aegirine-augite65.1.3b.2(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)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
Annite71.2.2b.3KFe2+3(AlSi3O10)(OH)2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Al-Si Framework Feldspathoids and related species
Cancrinite76.2.5.3(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Nepheline76.2.1.2Na3K(Al4Si4O16)
Sodalite76.2.3.1Na8(Al6Si6O24)Cl2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
Albite
var: Peristerite
-Na(AlSi3O8)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Hydronephelite'-
'Lepidomelane'-
Nepheline
var: Eleolite
-(Na,K)AlSiO4
Riebeckite-◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2

List of minerals for each chemical element

HHydrogen
H Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
H AnniteKFe32+(AlSi3O10)(OH)2
H AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
H DiasporeAlO(OH)
H GibbsiteAl(OH)3
H NatroliteNa2Al2Si3O10 · 2H2O
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
CCarbon
C Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
OOxygen
O SodaliteNa8(Al6Si6O24)Cl2
O NephelineNa3K(Al4Si4O16)
O Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O AlbiteNa(AlSi3O8)
O AegirineNaFe3+Si2O6
O AnniteKFe32+(AlSi3O10)(OH)2
O FluorapatiteCa5(PO4)3F
O AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
O DiasporeAlO(OH)
O GibbsiteAl(OH)3
O MagnetiteFe2+Fe23+O4
O NatroliteNa2Al2Si3O10 · 2H2O
O ZirconZr(SiO4)
O CorundumAl2O3
O Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
O Nepheline (var: Eleolite)(Na,K)AlSiO4
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Albite (var: Peristerite)Na(AlSi3O8)
O Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
FFluorine
F FluorapatiteCa5(PO4)3F
F AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
NaSodium
Na SodaliteNa8(Al6Si6O24)Cl2
Na NephelineNa3K(Al4Si4O16)
Na Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Na AlbiteNa(AlSi3O8)
Na AegirineNaFe3+Si2O6
Na AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Na NatroliteNa2Al2Si3O10 · 2H2O
Na Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Na Nepheline (var: Eleolite)(Na,K)AlSiO4
Na Albite (var: Peristerite)Na(AlSi3O8)
Na Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al SodaliteNa8(Al6Si6O24)Cl2
Al NephelineNa3K(Al4Si4O16)
Al Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Al AlbiteNa(AlSi3O8)
Al AnniteKFe32+(AlSi3O10)(OH)2
Al DiasporeAlO(OH)
Al GibbsiteAl(OH)3
Al NatroliteNa2Al2Si3O10 · 2H2O
Al CorundumAl2O3
Al Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Al Nepheline (var: Eleolite)(Na,K)AlSiO4
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al Albite (var: Peristerite)Na(AlSi3O8)
SiSilicon
Si SodaliteNa8(Al6Si6O24)Cl2
Si NephelineNa3K(Al4Si4O16)
Si Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si AlbiteNa(AlSi3O8)
Si AegirineNaFe3+Si2O6
Si AnniteKFe32+(AlSi3O10)(OH)2
Si AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Si NatroliteNa2Al2Si3O10 · 2H2O
Si ZirconZr(SiO4)
Si Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Si Nepheline (var: Eleolite)(Na,K)AlSiO4
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si Albite (var: Peristerite)Na(AlSi3O8)
Si Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
ClChlorine
Cl SodaliteNa8(Al6Si6O24)Cl2
KPotassium
K NephelineNa3K(Al4Si4O16)
K AnniteKFe32+(AlSi3O10)(OH)2
K AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
K Nepheline (var: Eleolite)(Na,K)AlSiO4
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca FluorapatiteCa5(PO4)3F
Ca Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
TiTitanium
Ti AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
FeIron
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe AegirineNaFe3+Si2O6
Fe AnniteKFe32+(AlSi3O10)(OH)2
Fe AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Fe MagnetiteFe2+Fe23+O4
Fe Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
ZrZirconium
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Barker, D.S. (1965) Alkalic rocks at Litchfield, Maine: Journal of Petrology: 6(1): 1-27.
King, V. and Foord, E. (1994) Mineralogy of Maine, volume 1.
Le Maitre (editor) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press.
West, D.P., Bradley, D., & Coish, R. (2016) The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187.

Mindat Articles

The Litchfield, Maine Nepheline Syenite Pluton by Douglas Watts


Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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