Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.90-3.02
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Subconchoidal, Conchoidal
Cleavage
Absent
Indistinct on {110}
Mohs Hardness
6.5-75-5.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
CaBePO 4(F,OH)Ulrich Henn and Claudio C.