Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.605.6-5.76
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
[001] perfect; [100] distinct
Mohs Hardness
6-6.52.5-3
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)