Tenacity
-
Very brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.93.30-3.40
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{???} Indistinct
{010} perfect, {110} distinct, {100} in traces
Mohs Hardness
4.56.5-7
2
10
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Chemical Composition
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references