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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
Diamond Jo Quarry, Magnet Cove, Hot Spring County, Arkansas, USA


Locality type:Quarry
Classification
Species:'Apophyllite Group' (not an IMA approved species)
Formula:AB4[Si8O20]X · 8H2O
Comments:Occurs in miarolitic cavities and in masses in garnet-pseudoleucite syenite and nepheline syenite pegmatite.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Eudialyte1
Data
Mineral Data:Click here to view Apophyllite Group data
Locality Data:Click here to view Diamond Jo Quarry, Magnet Cove, Hot Spring County, Arkansas, USA
Data Identifiers
Mindat Occurrence Record ID:62949
Long-form Identifier:1:3:62949:8
GUID (UUID V4):0
Nearest other occurrences of Apophyllite Group
2.3km (1.4 miles) ⓘCove Creek Bridge and The Branch area, Magnet Cove, Hot Spring County, Arkansas, USA
59.7km (37.1 miles) ⓘBig Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
61.7km (38.4 miles) ⓘGranite Mountain Quarry No. 1, Granite Mountain Area, Little Rock, Pulaski County, Arkansas, USA
References
Erickson, Ralph Leroy
Blade, Lawrence Vernon (1963) Geochemistry and petrology of the alkalic igneous complex at Magnet Cove, Arkansas. USGS Prof. Paper 425.
Smith, A.E. Jr. (1989) Minerals from the Miarolitic Cavities at the Diamond Jo Quarry. Rocks & Minerals: 64(4): 300-307.
 
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