Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.602.82
1
7.18
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Fracture
-
-
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Perfect in one direction, indistinct in one direction
Mohs Hardness
6-76
2
10
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Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]