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
Case Quarries, Portland, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Annite
Formula:KFe32+(AlSi3O10)(OH)2
Comments:fka biotite
Habit:anhedral tabular
Colour:black
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Albite2
Quartz2
Cordierite2
Data
Mineral Data:Click here to view Annite data
Locality Data:Click here to view Case Quarries, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:720481
Long-form Identifier:1:3:720481:4
GUID (UUID V4):0
Localities for Annite in this Region
Case Quarry No. 1, Case Quarries, Portland, Middlesex County, Connecticut, USA
Nearest other occurrences of Annite
0.0km (0.0 miles) ⓘCase Quarry No. 1, Case Quarries, Portland, Middlesex County, Connecticut, USA
1.3km (0.8 miles) ⓘGotta-Walden Prospect, Portland, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
1.8km (1.1 miles) ⓘAndrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA
2.1km (1.3 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.2km (1.4 miles) ⓘHollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.3km (1.4 miles) ⓘHowe Quarry (Howe #1 Quarry; Huspband Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.4km (1.5 miles) ⓘGriswold Quarry, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.6km (1.6 miles) ⓘGas pipeline excavation, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
References
Ralph Lieser of Pappy’s Beryl Shop, East Hampton
and Howard Pate of Fluorescent House, Branford, Connecticut.
Schooner, Richard. (1958): The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner
 
and/or  
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