Thomaston Dam pegmatite, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| Thomaston Dam pegmatite | Pegmatite |
| Thomaston Dam | Dam |
| Thomaston | - not defined - |
| Litchfield County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 41' 35'' North , 73° 3' 38'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Thomaston | 1,910 (2017) | 2.4km |
| Plymouth | 12,284 (2017) | 2.5km |
| Terryville | 5,387 (2017) | 4.5km |
| Northwest Harwinton | 3,252 (2017) | 9.4km |
| Bristol | 60,452 (2017) | 9.6km |
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 |
|---|---|---|
| Bristol Gem & Mineral Club | Bristol, Connecticut | 10km |
| Lapidary and Mineral Society of Central Connecticut | Meriden, Connecticut | 27km |
| New Haven Mineral Club | New Haven, Connecticut | 44km |
| Danbury Mineralogical Society | Danbury, Connecticut | 47km |
Mindat Locality ID:
264534
Long-form identifier:
mindat:1:2:264534:9
GUID (UUID V4):
618cd84c-61d4-4fb2-96c9-3f909f463142
A multi-zoned pegmatite with common mineralogy is well exposed in a rock cut where the road across the top of the dam crosses the spillway at the east end of the dam. Most of the pegmatite consists of a white, albite-rich zone with obvious, feathery, slightly radiating, muscovite-annite aggregates around 0.25 meters long that point toward the center of the pegmatite. The other major zone is a core consisting of white massive quartz with tan, very coarse-grained microcline and accessory muscovite. No other accessories are visible. Note that collecting is not allowed at the dam site per US Army Corps of Engineers site rules, and their office is right around the corner from this pegmatite. Plus the walls of the cut are a bit physically unstable.
The specific age of this pegmatite is unknown but it does intrude the Ordovician Ratlum Mountain Schist. It may be related to the Devonian Nonewaug Granite, which is widespread just to the north and west of the dam site.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
5 valid minerals.
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:
| ⓘ Albite Formula: Na(AlSi3O8) References: |
| ⓘ Annite Formula: KFe2+3(AlSi3O10)(OH)2 References: |
| ⓘ Microcline Formula: K(AlSi3O8) References: |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Quartz Formula: SiO2 References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Annite | 9.EC.20 | KFe2+3(AlSi3O10)(OH)2 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| K | Potassium | |
| K | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Annite | KFe32+(AlSi3O10)(OH)2 |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Piedmontia DomainDomain
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