Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Marienglas

A synonym of 'Selenite'
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Formula:
CaSO4 · 2H2O
German synonym of:
Name for waterclear colourless cleavages.


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Unique IdentifiersHide

Mindat ID:
26599 (as Marienglas)
5527 (as Selenite)
1784 (as Gypsum)
Long-form identifier:
mindat:1:1:26599:5 (as Marienglas)
mindat:1:1:5527:3 (as Selenite)
mindat:1:1:1784:4 (as Gypsum)

Internet Links for MarienglasHide

References for MarienglasHide

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