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Hurlbutite
Hurlbutite

Apophyllite
Apophyllite



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Hurlbutite
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Apophyllite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.90
Conchoidal
None
6
CaBe 2(PO 4) 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
2.30-2.50
Uneven
Perfect on (001)
4.5-5
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.