Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.772.40-2.42
1
7.18
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Fracture
-
-
Cleavage
{110} Perfect, {110} Perfect
{010} Perfect, {001} Distinct
Mohs Hardness
5-64.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references