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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Annite from
Andrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Annite
Formula:KFe32+(AlSi3O10)(OH)2
Comments:(fka biotite) occurs only scantily and in very small plates (Bastin 1910)
Colour:black
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Annite data
Locality Data:Click here to view Andrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:720479
Long-form Identifier:1:3:720479:1
GUID (UUID V4):0
Nearest other occurrences of Annite
0.3km (0.2 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
0.9km (0.6 miles) ⓘHowe Quarry (Howe #1 Quarry; Huspband Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.2km (0.7 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.3km (0.8 miles) ⓘGriswold Quarry, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.4km (0.9 miles) ⓘGotta-Walden Prospect, Portland, Middlesex County, Connecticut, USA
1.4km (0.9 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘGas pipeline excavation, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.5km (1.0 miles) ⓘPegmatite prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.6km (1.0 miles) ⓘEureka Quarries, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
1.6km (1.0 miles) ⓘHollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
References
Bastin (1910)
Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.
 
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