Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.21-3.38
1
7.18
👆🏻
Fracture
Conchoidal
Irregular/uneven, Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on {001}
Mohs Hardness
5.5-66-7
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references