Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.65-4.55-9999
1
7.18
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Fracture
Conchoidal
-
Cleavage
None, but may exhibit slight parting
Indiscernible
Mohs Hardness
7.5-8-9999
2
10
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Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
Ca10(Mg,Fe)2(Si2O7)2(SiO4)2O(OH)2