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Biotite
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Biotite
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| Biotite Mabubas Pegmatite, Mabubas, Ambriz City Council, Bengo Province, Angola
Item-No.: MIN5470 Price: 72.00 EUR
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| Biotite Freita Mountain, Arouca, Aveiro District, Portugal
Item-No.: MIN5506 Price: 100.00 EUR
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| Biotite Mabubas Pegmatite, Mabubas, Ambriz City Council, Bengo Province, Angola
Item-No.: MIN6064 Price: 80.00 EUR
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| Biotite Mabubas Pegmatite, Mabubas, Ambriz City Council, Bengo Province, Angola
Item-No.: MIN6224 Price: 85.00 EUR
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| Biotite Dolní Bory, Moravia, Czech Republic
Item-No.: MINS1525 Price: 12.00 EUR
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Synonyms: |
Black Mica, Dark Mica, Meroxen, Oderite, Odenite, Odite |
Classification: |
Phyllosilicates, a series or subgroup of the Mica Group, As single mineral not recognised by the IMA 1999 |
Chemical formula: |
K(Mg,Fe2+)3(Si3Al)O10(OH,F)2 |
Crystal system: |
Monoclinic |
Density (g/cm3): |
2,77 - 3,3 |
Tenacity: |
Flexible |
Cleavage: |
Perfect on {0001} |
Fracture: |
Micaceous |
Hardness (Mohs): |
2 - 3 |
Colour: |
Black, brown, greenisch or redisch black |
Lustre: |
Vitreous, Pearly |
Streak: |
White, grey-white |
Application: |
Insulation in electrotechnology |
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