Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.65-4.553.1-3.2
1
7.18
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Fracture
Conchoidal
-
Cleavage
None, but may exhibit slight parting
Vitreous, pearly on cleavage
Mohs Hardness
7.5-83-4
2
10
👆🏻
Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references