Feldspar is a widespread group of rock-forming minerals. Feldspars form two isomorphic series: albite - orthoclase and albite - anorthite. It has a number of types: albite, oligoclase, andesine, labradorite, bytonite, anorthite, orthoclase, adularia, microcline, sanidine, celsian.
You can see feldspar stone for sale and buy it in the Minerals of Russia online store.
General | |
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Category | Tectosilicate |
Formula (repeating unit) |
KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 |
IMA symbol | Fsp |
Crystal system | Triclinic or monoclinic |
Identification | |
Color | pink, white, gray, brown, blue |
Cleavage | two or three |
Fracture | along cleavage planes |
Mohs scale hardness | 6.0–6.5 |
Luster | Vitreous |
Streak | white |
Diaphaneity | opaque |
Specific gravity | 2.55–2.76 |
Density | 2.56 |
Refractive index | 1.518–1.526 |
Birefringence | first order |
Pleochroism | none |
Other characteristics | exsolution lamellae common |