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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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Unnamed (Ca Arsenate Hydrate III)

A synonym of Ferrarisite
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Formula:
Ca5(AsO4)2(HAsO4)2 · 9H2O
Synonym:
A synonym of Ferrarisite
Reported from Anton mine, Wittichen area, Black Forest, Germany, in association with pharmacosiderite.

Note: the PXRD pattern is slightly shifted when compared to that of ferrarisite; suggested symmetry is monoclinic; nα also differs (unless there is a typo).


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Unique IdentifiersHide

Mindat ID:
47254 (as Unnamed (Ca Arsenate Hydrate III))
1485 (as Ferrarisite)
Long-form identifier:
mindat:1:1:47254:0 (as Unnamed (Ca Arsenate Hydrate III))
mindat:1:1:1485:0 (as Ferrarisite)

Internet Links for Unnamed (Ca Arsenate Hydrate III)Hide

References for Unnamed (Ca Arsenate Hydrate III)Hide

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