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Muscovite from
Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA

Locality type:Quarry
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Comments:The "ball peen" habit of radiating, curved crystals is particularly well developed.
Tabular crystals range from 1 to 24 inches in diameter and 1/8 to 12 inches in thickness. Most of the books are about 5 inches in diameter and 1 inch thick.
About 15 percent of the muscovite visible in the wall zone is pseudomoorphed by what appears to be albite and quartz. Perfect pseudomorphs after muscovite have been formed. The replacement was limited to certain parts of the zone; these are irregular in outline and appear distributed without relation to the original structural or mineralogical features of the zone. Within these parts practically all the muscovite adjacent to the wall rock contact, including that in the border zone, has been replaced, but mica in the inner one-third or one-fourth of the wall zone is mostly unaffected. Large books that extend across the full thickness of the zone grade from unaltered muscovite in the inner part to pseudomorphs in the outer part.
Habit:pseudohexagonal tabular prisms, curved subparallel aggregates (ballpeen habit)
Colour:silver, gray
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Believed Valid
References
References:Cameron et al (1954) USGS Prof Paper 255; Shainin (1946); Rocks & Minerals (1995) 70:396-409
Associated Minerals Based on Photo Data:
Elbaite3 photos of Muscovite associated with Elbaite at this locality.
Fluorapatite3 photos of Muscovite associated with Fluorapatite at this locality.
Cyrtolite2 photos of Muscovite associated with Cyrtolite at this locality.
Albite2 photos of Muscovite associated with Albite at this locality.
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA
Photo GalleryView Gallery (7 photos)
Nearest other occurrences of Muscovite
4.3km (2.7 miles) Schorl locality, Wilton, Fairfield County, Connecticut, USA
4.8km (3.0 miles) Redding Glen (Redding Ridge), Redding (Reading), Fairfield County, Connecticut, USA
5.2km (3.2 miles) Ridgefield, Fairfield County, Connecticut, USA
6.9km (4.3 miles) Titicus Mica Quarry, Ridgefield, Fairfield County, Connecticut, USA
7.0km (4.4 miles) Casey Quarry (Ridgefield pegmatite), Ridgefield, Fairfield County, Connecticut, USA
12.1km (7.5 miles) Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA
14.3km (8.9 miles) New Canaan, Fairfield County, Connecticut, USA
14.9km (9.2 miles) Western Connecticut State College, Danbury, Fairfield County, Connecticut, USA
15.4km (9.6 miles) Interstate 84 and US Route 202 interchange, Danbury, Fairfield County, Connecticut, USA
16.1km (10.0 miles) North Street mall, Danbury, Fairfield County, Connecticut, USA
 
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