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

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PhotosMapsSearch
Latitude & Longitude (WGS84):
44° 12' 29'' North , 69° 55' 0'' West
Latitude & Longitude (decimal):
44.20833,-69.91667
GeoHash:
G#: dry73pbhp
GRN:
N30W37
Age:
239 ± 1 Ma
Geologic Time:
Middle Triassic
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.
Köppen climate type:
Dfb : Warm-summer humid continental climate
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
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Kennebec Rocks and Minerals ClubWinthrop, Maine12km
Oxford County Mineral and Gem AssociationSouth Paris, Maine48km
Mindat Locality ID:
7380
Long-form identifier:
mindat:1:2:7380:9
GUID (UUID V4):
ea5b6331-2ada-4a72-973e-1cce3f1f6c00


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 Gallery Strunz Chemical Elements

Mineral List


18 valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Rock Types Recorded

Note: 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
ⓘ Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ Albite var. Peristerite
Formula: Na(AlSi3O8)
References:
Doug Watts
ⓘ Annite
Formula: KFe2+3(AlSi3O10)(OH)2
ⓘ Astrophyllite
Formula: K2NaFe2+7Ti2Si8O26(OH)4F
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
References:
Frank W. Clarke
ⓘ Cancrinite
Formula: (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
ⓘ Corundum
Formula: Al2O3
ⓘ Diaspore
Formula: AlO(OH)
ⓘ Fluorapatite
Formula: Ca5(PO4)3F
ⓘ Gibbsite
Formula: Al(OH)3
ⓘ 'Hydronephelite' (FRL)
Type Locality:
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. It is also fluorescent in Shortwave UV.
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ 'Mica Group var. Lepidomelane'
ⓘ Microcline
Formula: K(AlSi3O8)
References:
Bayley (1892)
ⓘ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
ⓘ Nepheline
Formula: Na3K(Al4Si4O16)
ⓘ Nepheline var. Eleolite
Formula: (Na,K)AlSiO4
ⓘ Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘ Sodalite
Formula: Na4(Si3Al3)O12Cl
ⓘ Zircon
Formula: Zr(SiO4)

Gallery:

Na(AlSi3O8)ⓘ Albite
(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2Oⓘ Cancrinite
Fe2+Fe3+2O4ⓘ Magnetite
Na3K(Al4Si4O16)ⓘ Nepheline
Na4(Si3Al3)O12Clⓘ Sodalite
Zr(SiO4)ⓘ Zircon

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘCorundum4.CB.05Al2O3
ⓘDiaspore4.FD.10AlO(OH)
ⓘGibbsite4.FE.10Al(OH)3
Group 8 - Phosphates, Arsenates and Vanadates
ⓘFluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
ⓘZircon9.AD.30Zr(SiO4)
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘAegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘAegirine9.DA.25NaFe3+Si2O6
ⓘAstrophyllite9.DC.05K2NaFe2+7Ti2Si8O26(OH)4F
ⓘRiebeckite9.DE.25◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘAnnite9.EC.20KFe2+3(AlSi3O10)(OH)2
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘvar. Eleolite9.FA.05(Na,K)AlSiO4
ⓘMicrocline9.FA.30K(AlSi3O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘvar. Peristerite9.FA.35Na(AlSi3O8)
ⓘCancrinite9.FB.05(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
ⓘSodalite9.FB.10Na4(Si3Al3)O12Cl
ⓘNatrolite9.GA.05Na2Al2Si3O10 · 2H2O
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Mica Group
var. Lepidomelane'		-
ⓘ'Hydronephelite' (TL)-

List of minerals for each chemical element

HHydrogen
Hⓘ AnniteKFe32+(AlSi3O10)(OH)2
Hⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Hⓘ DiasporeAlO(OH)
Hⓘ GibbsiteAl(OH)3
Hⓘ NatroliteNa2Al2Si3O10 · 2H2O
Hⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
CCarbon
Cⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
OOxygen
Oⓘ AegirineNaFe3+Si2O6
Oⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ AnniteKFe32+(AlSi3O10)(OH)2
Oⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Oⓘ CorundumAl2O3
Oⓘ DiasporeAlO(OH)
Oⓘ FluorapatiteCa5(PO4)3F
Oⓘ GibbsiteAl(OH)3
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MicroclineK(AlSi3O8)
Oⓘ NephelineNa3K(Al4Si4O16)
Oⓘ NatroliteNa2Al2Si3O10 · 2H2O
Oⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Oⓘ SodaliteNa4(Si3Al3)O12Cl
Oⓘ ZirconZr(SiO4)
Oⓘ Albite var. PeristeriteNa(AlSi3O8)
Oⓘ Nepheline var. Eleolite(Na,K)AlSiO4
FFluorine
Fⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluorapatiteCa5(PO4)3F
NaSodium
Naⓘ AegirineNaFe3+Si2O6
Naⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Naⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Naⓘ NephelineNa3K(Al4Si4O16)
Naⓘ NatroliteNa2Al2Si3O10 · 2H2O
Naⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Naⓘ SodaliteNa4(Si3Al3)O12Cl
Naⓘ Albite var. PeristeriteNa(AlSi3O8)
Naⓘ Nepheline var. Eleolite(Na,K)AlSiO4
MgMagnesium
Mgⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ AnniteKFe32+(AlSi3O10)(OH)2
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Alⓘ CorundumAl2O3
Alⓘ DiasporeAlO(OH)
Alⓘ GibbsiteAl(OH)3
Alⓘ MicroclineK(AlSi3O8)
Alⓘ NephelineNa3K(Al4Si4O16)
Alⓘ NatroliteNa2Al2Si3O10 · 2H2O
Alⓘ SodaliteNa4(Si3Al3)O12Cl
Alⓘ Albite var. PeristeriteNa(AlSi3O8)
Alⓘ Nepheline var. Eleolite(Na,K)AlSiO4
SiSilicon
Siⓘ AegirineNaFe3+Si2O6
Siⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ AnniteKFe32+(AlSi3O10)(OH)2
Siⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Siⓘ MicroclineK(AlSi3O8)
Siⓘ NephelineNa3K(Al4Si4O16)
Siⓘ NatroliteNa2Al2Si3O10 · 2H2O
Siⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Siⓘ SodaliteNa4(Si3Al3)O12Cl
Siⓘ ZirconZr(SiO4)
Siⓘ Albite var. PeristeriteNa(AlSi3O8)
Siⓘ Nepheline var. Eleolite(Na,K)AlSiO4
PPhosphorus
Pⓘ FluorapatiteCa5(PO4)3F
SSulfur
Sⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
ClChlorine
Clⓘ SodaliteNa4(Si3Al3)O12Cl
KPotassium
Kⓘ AnniteKFe32+(AlSi3O10)(OH)2
Kⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MicroclineK(AlSi3O8)
Kⓘ NephelineNa3K(Al4Si4O16)
Kⓘ Nepheline var. Eleolite(Na,K)AlSiO4
CaCalcium
Caⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Caⓘ FluorapatiteCa5(PO4)3F
TiTitanium
Tiⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ AegirineNaFe3+Si2O6
Feⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Feⓘ AnniteKFe32+(AlSi3O10)(OH)2
Feⓘ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
ZrZirconium
Zrⓘ ZirconZr(SiO4)

Mindat Articles

Angie C. Merchant: 19th-Century Mineral Collector, and the Sodalite Locality of Litchfield, Maine by Peter Cristofono
The Litchfield, Maine Nepheline Syenite Pluton by Douglas Watts


Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Clarke, F.W. (1886) Minerals of Litchfield, Maine. Am. Jour. Sci. 31, 262-272.
Barker, D.S. (1965) Alkalic rocks at Litchfield, Maine: Journal of Petrology: 6(1): 1-27.
Edgar, A.D. (1965) The mineralogical composition of some nepheline alteration products. Am. Mineral. 50, 978-989.
King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey.
Le Maitre, R. W. - Ed. (2002) Igneous Rocks - A Classification and Glossary of Terms (2nd ed.) Cambridge University Press. doi:10.1017/cbo9780511535581
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.
www.mindat.org (2020) https://www.mindat.org/a/ac_merchant
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