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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Satin Gypsum

A synonym of 'Satin Spar Gypsum'
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Formula:
CaSO4 · 2H2O
Synonym:
A synonym of Satin Spar Gypsum
An alternative name for 'Satin Spar' Gypsum given to try to distinguish it from the original 'Satin Spar' which was a variety of Calcite.

First noted in "A Syllabus of Lectures in Mineralogy" by Edward Daniel Clarke (1807).


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Unique IdentifiersHide

Mindat ID:
34361 (as Satin Gypsum)
8574 (as Satin Spar Gypsum)
1784 (as Gypsum)
Long-form identifier:
mindat:1:1:34361:9 (as Satin Gypsum)
mindat:1:1:8574:4 (as Satin Spar Gypsum)
mindat:1:1:1784:4 (as Gypsum)

Internet Links for Satin GypsumHide

References for Satin GypsumHide

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