Tenacity
Slightly sectile
-
Solubility
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
-
Durability
-
-
Specific Gravity
23.31
1
7.18
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Fracture
Uneven
-
Cleavage
Prismatic {10 1 0}, perfect
Indiscernible
Mohs Hardness
2-2.5-9999
2
10
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Chemical Composition
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)