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Montebrasite
Montebrasite

Alunite
Alunite



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Alunite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.98-3.10
Uneven, Conchoidal
{100} Perfect, {110} Good, {011} Distinct
5.5-6
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references
 
Brittle
Soluble
-
2.6-2.9
Conchoidal, Uneven
On {0001}, perfect
3.5-4
KAl3(SO4)2(OH)6