Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.05-5.222.25-2.40
1
7.18
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Fracture
Uneven
-
Cleavage
None
perfect on {010}; good on {100}
Mohs Hardness
5.5-65-5.5
2
10
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Chemical Composition
(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references