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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
Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA


03131260017272039972849.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
03600360017272051518028.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
02650920017272051527640.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
07329010017272059995071.jpg
Annite

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
03131260017272039972849.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
03600360017272051518028.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
02650920017272051527640.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
07329010017272059995071.jpg
Annite

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
09967180017272040018787.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
03996740017272051531356.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
02650920017272051527640.jpg
Annite, etc.

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
09090680017365507371150.jpg
Annite

Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
Locality type:Quarry
Classification
Species:Annite
Formula:KFe32+(AlSi3O10)(OH)2
Comments:Crystals apparently reached several dm long as they are typically found as fragments in the dump, sometimes interlayered with muscovite.
Habit:elongated tabular subhedral
Colour:black
Abundance at site:Common
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Muscovite4
Quartz3
Albite3
Beryl2
Data
Mineral Data:Click here to view Annite data
Locality Data:Click here to view Nathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:720498
Long-form Identifier:1:3:720498:2
GUID (UUID V4):0
Nearest other occurrences of Annite
0.2km (0.1 miles) ⓘState Forest Quarry No. 1, East Hampton, Middlesex County, Connecticut, USA
2.3km (1.4 miles) ⓘState Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
3.0km (1.8 miles) ⓘPenfield Quarry (Oak Leaf Quarry), Portland, Middlesex County, Connecticut, USA
3.0km (1.9 miles) ⓘGreat Hill Pond Brook pegmatite, Cobalt, East Hampton, Middlesex County, Connecticut, USA
3.2km (2.0 miles) ⓘPelton's Quarry, Portland, Middlesex County, Connecticut, USA
4.1km (2.5 miles) ⓘBishop Hill Schorl Locality, East Hampton, Middlesex County, Connecticut, USA
4.1km (2.6 miles) ⓘHale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
4.3km (2.7 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
4.3km (2.7 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
4.8km (3.0 miles) ⓘCase Quarry No. 1, Case Quarries, Portland, Middlesex County, Connecticut, USA
References
Moritz, Harold (n.d.) Personal Communication.
 
and/or  
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