Orthoclase
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Orthoclase
Item-No.: MIN5723 Price: 95.00 EUR
Erongo Mountain, Erongo Region, Namibia
Orthoclase, Albite
Item-No.: MINS84 Price: 26.00 EUR
Dolní Bory, Bory, Žďár nad Sázavou District, Vysočina Region, Czech Republic
| 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 |