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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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Juwelierborax

A synonym of Tincalconite
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Formula:
Na2(B4O7) · 5H2O
German synonym of:
This page provides mineralogical data about Juwelierborax.


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Unique IdentifiersHide

Mindat ID:
31302 (as Juwelierborax)
3967 (as Tincalconite)
Long-form identifier:
mindat:1:1:31302:5 (as Juwelierborax)
mindat:1:1:3967:9 (as Tincalconite)

Internet Links for JuwelierboraxHide

References for JuwelierboraxHide

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