Thomaston Dam
Thomaston
Litchfield County
Connecticut
The site consists of a roughly 900 ft long railway cut through a low hill composed of a pegmatite intrusion into the native schistose rock. Special note should be made that the ballast used for the railroad was from a mineralized trap rock quarry located about 20 miles southwest of Thomaston Dam. This has resulted in erroneous reports of occurences of datolite, prehnite, laumontite, natrolite, and chabazite in this formation.
Actinolite
Albite
Almandine
Anatase
Anglesite
Apophyllite
Aragonite
Autunite
Axinite
Barite
Beryl
Biotite
Brookite
Calcite
Cerussite
Chabazite
Chalcopyrite
Chlorite
Clinozoisite
Copiapite
Epidote
Fluorapatite
Fluorite
Galena
Graphite
Greenockite
Grossular
Harmatome
Hemimorphite
Heulandite
Hornblende
Hydrozincite
Ilemnite
Jarosite
Kaolinite
Kyanite
Magnetite
Malachite
Melanterite
Microcline
Montmorillonite
Mordenite ?
Muscovite
Oligoclase
Opal (var. hyalite)
Phillipsite
Phlogopite
Pyrite
Pyrolusite
Pyromorphite
Pyrrhotite
Quartz
Rutile
Schorl
Sillimanite
Smithsonite
Sphalerite
Staurolite
Stilbite
Stlpnomelane
Sulfur
Titanite
Vanadinite
Wulfenite
Wurtzite ?
Contaminants:
Prehnite
Natrolite
Datolite
Laumontite
Sources:
