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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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Potch Opal

A synonym of 'Opal-AG'
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Formula:
SiO2 · nH2O
Synonym:
A synonym of Opal-AG
This page provides mineralogical data about Potch Opal.


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Unique IdentifiersHide

Mindat ID:
32189 (as Potch Opal)
32187 (as Opal-AG)
3004 (as Opal)
Long-form identifier:
mindat:1:1:32189:3 (as Potch Opal)
mindat:1:1:32187:5 (as Opal-AG)
mindat:1:1:3004:1 (as Opal)

Similar NamesHide

Pitch OpalA variety of OpalSiO2 · nH2O

Internet Links for Potch OpalHide

References for Potch OpalHide

Reference List:
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