Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.98-4.043.355-3.433
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
Imperfect, poor one {100}
{???} Good, {???} Good
Mohs Hardness
4.5-5-9999
2
10
👆🏻
Chemical Composition
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)