Staurolite
The name of Staurolite is derived from the Greek in reference to the common twinning. A characteristic 60 degrees cross-shape is known as Saint Andrew´s penetration twinning more rare 90 degrees cross-shape as cruciform penetration twinning. Staurolite is a typical regional metamorphic mineral of intermediate grade.
Staurolite
Item-No.: 2757j Price: 12.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: 2758e Price: 12.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: 2758f Price: 12.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: 2758j Price: 12.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS5846 Price: 65.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS5845 Price: 85.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4893 Price: 58.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4896 Price: 52.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4897 Price: 35.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4899 Price: 46.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4904 Price: 62.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4900 Price: 43.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS6371 Price: 53.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Staurolite
Item-No.: MINS4894 Price: 46.00 EUR
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russia
Synonyms: | Croisette, Fairy Stone |
Classification: | Silicates, Nesosilicates, Staurolite Group |
Chemical formula: | Fe2+2Al9Si4O23(OH) |
Crystal system: | Monoclinic |
Density (g/cm3): | 3.74 - 3.83 measured, 3.686 calculated |
Tenacity: | Brittle |
Cleavage: | Distinct on {010} |
Fracture: | Sub-Conchoidal |
Hardness (Mohs): | 7 - 7,5 |
Colour: | Dark brown, brownish-black, red-brown |
Lustre: | Sub-Vitreous, Resinous |
Streak: | White to grayish |
Transparency: | Translucent |