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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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Pyrophane

A variety of 'Precious Opal' [Opal]
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Formula:
SiO2 · nH2O
Opal where colour play appears to wander about at random.


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Unique IdentifiersHide

Mindat ID:
9817 (as Pyrophane)
3004 (as Opal)
Long-form identifier:
mindat:1:1:9817:1 (as Pyrophane)
mindat:1:1:3004:1 (as Opal)

Chemistry of PyrophaneHide

Mindat Formula:
SiO2 · nH2O
Element Weights:
Element% weight
O61.458 %
Si35.961 %
H2.581 %

Calculated from ideal end-member formula.
Elements listed:
H, O, Si - search for minerals with similar chemistry

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for PyrophaneHide

References for PyrophaneHide

Reference List:
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