Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Pyrophyllite from
State Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA


Classification
Species:Pyrophyllite
Formula:Al2Si4O10(OH)2
Comments:Sillimanite, collected in a quartz vein through schist, is altered, in a few samples, to a very soft, greasy-feeling, white or gray material. X-ray study indicates a mixture of fine-grained paragonite and subsidiary pyrophyllite. A fingernail easily scratches it.
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Data
Mineral Data:Click here to view Pyrophyllite data
Locality Data:Click here to view State Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:920676
Long-form Identifier:1:3:920676:2
GUID (UUID V4):0
Nearest other occurrences of Pyrophyllite
58.5km (36.4 miles) ⓘSatan's Kingdom talc deposits, New Hartford, Litchfield County, Connecticut, USA
References
Schooner, Richard. (circa 1985), Untitled manuscript on central Connecticut mineralogy.
 
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