Dennis Hill locality (Litchfield sodalite locality), Litchfield, Kennebec County, Maine, USAi
| Regional Level Types | |
|---|---|
| Dennis Hill locality (Litchfield sodalite locality) | Deposit |
| Litchfield | Town |
| Kennebec County | County |
| Maine | State |
| USA | Country |
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Latitude & Longitude (WGS84):
44° 12' 29'' North , 69° 55' 0'' West
Latitude & Longitude (decimal):
Type:
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.
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Monmouth | 3,935 (2017) | 10.1km |
| Gardiner | 5,597 (2017) | 11.5km |
| Winthrop | 2,650 (2017) | 11.8km |
| Randolph | 1,772 (2017) | 12.2km |
| Farmingdale | 1,970 (2017) | 12.2km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Kennebec Rocks and Minerals Club | Winthrop, Maine | 12km |
| Oxford County Mineral and Gem Association | Bethel, Maine | 48km |
Nepheline-syenite deposit. Also known as the 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 ElementsMineral 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 DiagramDetailed Mineral List:
| ⓘ Aegirine Formula: NaFe3+Si2O6 |
| ⓘ Aegirine-augite Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 References: |
| ⓘ Albite Formula: Na(AlSi3O8) |
| ⓘ Albite var. Peristerite Formula: Na(AlSi3O8) References: |
| ⓘ Annite Formula: KFe2+3(AlSi3O10)(OH)2 |
| ⓘ Astrophyllite Formula: K2NaFe2+7Ti2[Si4O12]2O2(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: |
| ⓘ 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: |
| ⓘ 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:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Corundum | 4.CB.05 | Al2O3 |
| ⓘ | Diaspore | 4.FD.10 | AlO(OH) |
| ⓘ | Gibbsite | 4.FE.10 | Al(OH)3 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ | Aegirine-augite | 9.DA.20 | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
| ⓘ | Aegirine | 9.DA.25 | NaFe3+Si2O6 |
| ⓘ | Astrophyllite | 9.DC.05 | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| ⓘ | Riebeckite | 9.DE.25 | ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2 |
| ⓘ | Annite | 9.EC.20 | KFe2+3(AlSi3O10)(OH)2 |
| ⓘ | Nepheline | 9.FA.05 | Na3K(Al4Si4O16) |
| ⓘ | var. Eleolite | 9.FA.05 | (Na,K)AlSiO4 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Peristerite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Cancrinite | 9.FB.05 | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O |
| ⓘ | Sodalite | 9.FB.10 | Na4(Si3Al3)O12Cl |
| ⓘ | Natrolite | 9.GA.05 | Na2Al2Si3O10 · 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
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| H | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| H | ⓘ Biotite | K(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 | ⓘ Diaspore | AlO(OH) |
| H | ⓘ Gibbsite | Al(OH)3 |
| H | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| H | ⓘ Riebeckite | ◻[Na2][Fe32+Fe23+]Si8O22(OH)2 |
| C | Carbon | |
| C | ⓘ Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O |
| O | Oxygen | |
| O | ⓘ Aegirine | NaFe3+Si2O6 |
| O | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| O | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| O | ⓘ Biotite | K(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 | ⓘ Corundum | Al2O3 |
| O | ⓘ Diaspore | AlO(OH) |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| O | ⓘ Gibbsite | Al(OH)3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Nepheline | Na3K(Al4Si4O16) |
| O | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| O | ⓘ Riebeckite | ◻[Na2][Fe32+Fe23+]Si8O22(OH)2 |
| O | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Albite var. Peristerite | Na(AlSi3O8) |
| O | ⓘ Nepheline var. Eleolite | (Na,K)AlSiO4 |
| F | Fluorine | |
| F | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| Na | Sodium | |
| Na | ⓘ Aegirine | NaFe3+Si2O6 |
| Na | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Na | ⓘ Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O |
| Na | ⓘ Nepheline | Na3K(Al4Si4O16) |
| Na | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| Na | ⓘ Riebeckite | ◻[Na2][Fe32+Fe23+]Si8O22(OH)2 |
| Na | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| Na | ⓘ Albite var. Peristerite | Na(AlSi3O8) |
| Na | ⓘ Nepheline var. Eleolite | (Na,K)AlSiO4 |
| Mg | Magnesium | |
| Mg | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | Aluminium | |
| Al | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Al | ⓘ Biotite | K(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 | ⓘ Corundum | Al2O3 |
| Al | ⓘ Diaspore | AlO(OH) |
| Al | ⓘ Gibbsite | Al(OH)3 |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Nepheline | Na3K(Al4Si4O16) |
| Al | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| Al | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| Al | ⓘ Albite var. Peristerite | Na(AlSi3O8) |
| Al | ⓘ Nepheline var. Eleolite | (Na,K)AlSiO4 |
| Si | Silicon | |
| Si | ⓘ Aegirine | NaFe3+Si2O6 |
| Si | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Si | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Si | ⓘ Biotite | K(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 | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Nepheline | Na3K(Al4Si4O16) |
| Si | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| Si | ⓘ Riebeckite | ◻[Na2][Fe32+Fe23+]Si8O22(OH)2 |
| Si | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Albite var. Peristerite | Na(AlSi3O8) |
| Si | ⓘ Nepheline var. Eleolite | (Na,K)AlSiO4 |
| P | Phosphorus | |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| S | Sulfur | |
| S | ⓘ Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O |
| Cl | Chlorine | |
| Cl | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| K | Potassium | |
| K | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| K | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Nepheline | Na3K(Al4Si4O16) |
| K | ⓘ Nepheline var. Eleolite | (Na,K)AlSiO4 |
| Ca | Calcium | |
| 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 | ⓘ Fluorapatite | Ca5(PO4)3F |
| Ti | Titanium | |
| Ti | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | Iron | |
| Fe | ⓘ Aegirine | NaFe3+Si2O6 |
| Fe | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Fe | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Fe | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Riebeckite | ◻[Na2][Fe32+Fe23+]Si8O22(OH)2 |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
Mindat Articles
Angie C. Merchant: 19th-Century Mineral Collector, and the Sodalite Locality of Litchfield, Maine by Peter CristofonoThe Litchfield, Maine Nepheline Syenite Pluton by Douglas Watts
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Ganderia DomainDomain
- GranderiaPassive Margin
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Dennis Hill locality, Litchfield, Kennebec County, Maine, USA