Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.28-3.443.95-4.10
1
7.18
👆🏻
Fracture
Uneven, Splintery
Uneven
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
5.0-6.03.5-4
2
10
👆🏻
Chemical Composition
Na2Fe2+3Fe3+2Si8O22(OH)2
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references