Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.031.65-1.99
1
7.18
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Fracture
Uneven
Uneven
Cleavage
[110] perfect; [010] distinct
{010} Perfect, {110} Perfect
Mohs Hardness
5-62-2.5
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)