Biotite
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Biotite
Mabubas Pegmatite, Mabubas, Ambriz City Council, Bengo Province, Angola
Item-No.: MIN5470
Price: 72.00 EUR
Biotite
Freita Mountain, Arouca, Aveiro District, Portugal
Item-No.: MIN5506
Price: 100.00 EUR
Biotite
Mabubas Pegmatite, Mabubas, Ambriz City Council, Bengo Province, Angola
Item-No.: MIN6064
Price: 80.00 EUR
Biotite
Mabubas Pegmatite, Mabubas, Ambriz City Council, Bengo Province, Angola
Item-No.: MIN6224
Price: 85.00 EUR
Biotite
Dolní Bory, Moravia, Czech Republic
Item-No.: MINS1525
Price: 12.00 EUR
| 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 |