Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.98-4.04
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Imperfect, poor one {100}
Mohs Hardness
5-64.5-5
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references