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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Opaal

A synonym of Opal
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Estonian and Dutch name for:
This page provides mineralogical data about Opaal.


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Unique IdentifiersHide

Mindat ID:
36909 (as Opaal)
3004 (as Opal)
Long-form identifier:
mindat:1:1:36909:7 (as Opaal)
mindat:1:1:3004:1 (as Opal)

Similar NamesHide

Opal-AA variety of OpalSiO2 · nH2O

Internet Links for OpaalHide

References for OpaalHide

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