Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.762.56-2.60
1
7.18
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Fracture
Uneven
Uneven, ConchoidalWalter Schumann
Cleavage
{010} Perfect, {001} Distinct
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Mohs Hardness
3.5-46-6.5
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8