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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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Apophyllite Group from
Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA


07935790017368349674387.jpg
Fluorapophyllite-(K)

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
00853700017272033827156.jpg
Fluorapophyllite-(K)

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
01910030017272012397393.jpg
Fluorapophyllite-(K)

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
00853700017272033827156.jpg
Fluorapophyllite-(K)

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
01910030017272012397393.jpg
Fluorapophyllite-(K)

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
00853700017272033827156.jpg
Fluorapophyllite-(K)

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
Locality type:Quarry
Classification
Species:'Apophyllite Group' (not an IMA approved species)
Formula:AB4[Si8O20]X · 8H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Apophyllite Group data
Locality Data:Click here to view Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
Data Identifiers
Mindat Occurrence Record ID:45189
Long-form Identifier:1:3:45189:7
GUID (UUID V4):0
Nearest other occurrences of Apophyllite Group
2.8km (1.7 miles) ⓘGranite Mountain Quarry No. 1, Granite Mountain Area, Little Rock, Pulaski County, Arkansas, USA
59.7km (37.1 miles) ⓘDiamond Jo Quarry, Magnet Cove, Hot Spring County, Arkansas, USA
59.7km (37.1 miles) ⓘCove Creek Bridge and The Branch area, Magnet Cove, Hot Spring County, Arkansas, USA
References
Peacor, Donald R., Dunn, Pete J., Simmons, William B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine, 48 (346) 93-96 doi:10.1180/minmag.1984.048.346.12
Smith, Arthur E. Jr. (1997) Collecting Arkansas Minerals. L. R. Ream Publishing, Coeur d'Alene, ID.
 
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