Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.54-2.782.60-2.64
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Splintery, Conchoidal
Cleavage
Good in three directions
Absent
Mohs Hardness
5-66.5-7
2
10
👆🏻
Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2Arthur Thomas , Gemstones (2009)