Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.263.98-4.04
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
None
Imperfect, poor one {100}
Mohs Hardness
-99994.5-5
2
10
👆🏻
Chemical Composition
NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references