Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.82-4.002.56-2.60
1
7.18
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Fracture
-
Uneven, ConchoidalWalter Schumann
Cleavage
{???} Indistinct
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Mohs Hardness
5.56-6.5
2
10
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Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8