Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.753.07-3.13
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven
Cleavage
Imperfect on {110}
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
5.53-3.5
2
10
👆🏻
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references