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Muscovite from
Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA

Locality type:Park
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Comments:Abundant as a pure micaceous layer along the contacts of the topaz-fluorite-quartz veins with the amphibolite, reported as the hydrous variety "margarodite" by Shannon (1921b). However, this mica matches the physical properties of muscovite and was also identified by Raman spectroscopy. As flakes in the veins, and as coatings and replacement of topaz, also reported by Shannon (1921b) as "margarodite", but which is a mixture of muscovite and paragonite. Also an accessory in the pegmatites.

"A foliated and radiated pearly mica from this locality has been widely distributed in old collections, labeled margarodite. This mica is very abundant in the limekiln vein, where it occurs as an alteration product of the topaz as aggregates of scales often grouped in spherical or fan-shaped bunches. In color the margarodite ranges from pale yellow to smoky brownish gray. The yellowish variety occurs replacing the large crystals of topaz. The grayish type is coarser and occurs in open spaces lined by topaz crystals and as narrow veins in which the crystals grow from either wall and inter¬lock loosely in the center of the vein, the space of which are filled with colorless to purple fluorite. Some of the coarsest of the mica is deep blue, apparently from thin layers of deep blue fluorite inserted between the laminae. The margarodite is in plates which uniformly show the structure found in commercial mica deposits and known as feathering evidently due to twinning. In appearance this twinning is more pearly than ordinary muscovite and laminae are more brittle...Mica of this foliated type occurs in practically all of the quartz veins of this vicinity, as seen especially in the main pit and in small openings along the tramway." (Shannon, 1921b).
Habit:anhedral tabular, fine-grained replacements of topaz
Colour:silvery
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Extremely common
Confirmation
Validity:Confirmed
Confirmation Methods:Raman Spectroscopy
References
References:Shannon, Earl V. (1921a): The Old Tungsten Mine in Trumbull, Connecticut. American Mineralogist 6:126-128.; Shannon, Earl V. (1921b), Some Minerals from the Old Tungsten Mine at Long Hill in Trumbull, Connecticut. Proceedings U.S. National Museum: 58(2348): 469-482.; Januzzi, Ronald E. (1976): Mineral Localities of CT and Southeastern NY State. The Mineralogical Press, Danbury, Connecticut.; Sullivan, Earle C. (1985): History and Minerals of Old Mine Park. Second Edition, Revised and Expanded. Trumbull Historical Society, Inc.
Associated Minerals Based on Photo Data:
Topaz3 photos of Muscovite associated with Topaz at this locality.
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
Nearest other occurrences of Muscovite
0.4km (0.2 miles) Old Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
0.6km (0.4 miles) Corporate Drive road cut, Long Hill, Trumbull, Fairfield County, Connecticut, USA
0.8km (0.5 miles) State Route 111 construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
1.4km (0.9 miles) Porter Hill Road roadcut, Long Hill, Trumbull, Fairfield County, Connecticut, USA
7.5km (4.7 miles) New England Materials quarry, Monroe, Fairfield County, Connecticut, USA
9.0km (5.6 miles) The Cascades, Fairfield, Fairfield County, Connecticut, USA
9.2km (5.7 miles) East Village pegmatite, Monroe, Fairfield County, Connecticut, USA
12.6km (7.8 miles) Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA
14.0km (8.7 miles) Redding Glen (Redding Ridge), Redding (Reading), Fairfield County, Connecticut, USA
15.3km (9.5 miles) Interstate 84 road cuts (Route 6A bypass), Newtown, Fairfield County, Connecticut, USA
 
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