Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.103.7-3.9
1
7.18
👆🏻
Fracture
Splintery, Granular
Conchoidal
Cleavage
None
{001} perfect; {111} imperfect, may exhibit parting on , {011}
Mohs Hardness
6-6.55.5-6
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)