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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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Maria-Glass

A synonym of 'Selenite'
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Formula:
CaSO4 · 2H2O
Synonym:
A synonym of Selenite
This page provides mineralogical data about Maria-Glass.


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Unique IdentifiersHide

Mindat ID:
5525 (as Maria-Glass)
5527 (as Selenite)
1784 (as Gypsum)
Long-form identifier:
mindat:1:1:5525:9 (as Maria-Glass)
mindat:1:1:5527:3 (as Selenite)
mindat:1:1:1784:4 (as Gypsum)

Internet Links for Maria-GlassHide

References for Maria-GlassHide

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