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> Minerals
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Orthoclase
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| Orthoclase
 Erongo Mountain, Erongo Region, Namibia
Item-No.: MIN5723
Price: 95.00 EUR
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| Orthoclase, Albite
Dolní Bory, Bory, Žďár nad Sázavou District, Vysočina Region, Czech Republic
Item-No.: MINS84
Price: 26.00 EUR
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| Synonyms: |
Argillyite, Common Feldspar, Cottaite, Leelite, Muldan, Murchinsonite, Paradoxite |
| Classification: |
Silicates, Tektosilicates, Feldspar group |
| Chemical formula: |
K(AlSi3O8) |
| Crystal system: |
Monoclinic |
| Density (g/cm3): |
2,55 - 2,63 measured, 2,563 calculated |
| Tenacity: |
Brittle |
| Cleavage: |
Perfect on {001}, good on {010} |
| Fracture: |
Irregular/uneven, conchoidal |
| Hardness (Mohs): |
6 |
| Colour: |
Colorless to white, greenish white, grayish yellow, pale pink |
| Lustre: |
Vitreous, sub-vitreous, resinous |
| Streak: |
White |
| Application: |
Ceramics, abrasives, crushed stone, occasional as gemstone |
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