Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.54-2.786.50-7.00
1
7.18
👆🏻
Fracture
Conchoidal
Irregular, Conchoidal
Cleavage
Good in three directions
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
5-63
2
10
👆🏻
Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
PbMoO 4Walter Schumann , Gemstones of the world (2001)