| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS1507 Price: 20.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS1508 Price: 19.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS4777 Price: 22.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5353 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5426 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5441 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5442 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5443 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5444 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5054 Price: 9.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5055 Price: 14.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5033 Price: 9.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5034 Price: 15.00 EUR
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| Tourmaline Bobrůvka, Moravia, Czech Republic
Item-No.: MINS5035 Price: 15.00 EUR
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| Tourmaline Smolné Pece, Potůčky, Karlovy Vary Region, Czech Republik
Item-No.: MINS4776 Price: 45.00 EUR
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Synonyms: |
Afrisite, Cockle, Iron Tourmaline, Schirl, Shirl, Shorl |
Classification: |
Silicates, Cyclosilicates, Tourmaline Group |
Chemical formula: |
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) |
Crystal system: |
Trigonal |
Density (g/cm3): |
3.18 - 3.22 measured, 3.244 calculated |
Tenacity: |
Brittle |
Cleavage: |
Very poor on vertical C axis |
Fracture: |
Irregular, uneven, Sub-conchoidal |
Hardness (Mohs): |
7 - 7.5 |
Colour: |
Bluish-black to black, sometimes brownish-black, rarely greenish-black |
Lustre: |
Vitreous, Resinous |
Streak: |
Greyish-white to bluish-white |
Transparency: |
Translucent, opaque |
Co-type locality: |
Zschorlau, Schneeberg, Ore Mountains, Saxony, Germany |
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