Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.263.07-3.13
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
None
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
-99993-3.5
2
10
👆🏻
Chemical Composition
NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references