Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.652.9
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
3,1
{???} Indistinct
Mohs Hardness
74.5
2
10
👆🏻
Chemical Composition
SiO 2Ulrich Henn and Claudio C.
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)