Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.95-3.07
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
{010} Good, {100} Distinct
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Mohs Hardness
5-5.55-6
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.