Natrolite
Apophyllite, Natrolite
Item-No.: MIN5899 Price: 55.00 EUR
Mariánská Skála, Ústí nad Labem, Ústí Region, Bohemia, Czech Republic
| Synonyms: | Apoanalcite, Cockalite, Crocalite, Epinatrolite, Lehuntite, Needlestone, Portite, Radiolite |
| Classification: | Silicates, Tektosilicates, Zeolite Group |
| Chemical formula: | Na2(Si3Al2)O10·2H2O |
| Crystal system: | Orthorhombic |
| Density (g/cm3): | 2,2 - 2,26 measured, 2,25 calculated |
| Tenacity: | Brittle |
| Cleavage: | Perfect on {110} |
| Fracture: | Irregular/uneven, sub-conchoidal |
| Hardness (Mohs): | 5 - 5,5 |
| Colour: | White, colorless, red, yellow, brown, green, bluish |
| Lustre: | Vitreous, pearly |
| Streak: | White |
| Type locality: | Hohentwiel, Singen, Hegau, Baden-Württemberg, Germany |