Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.772.52-2.60
1
7.18
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Fracture
-
Uneven, Conchoidal
Cleavage
{110} Perfect, {110} Perfect
{0001} Imperfect, {1120} Imperfect
Mohs Hardness
5-65.5-6
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references