Mineral Specimen and Product Inventory Search
- Availability
- Available
- Price
- $25.00
- Featured
- Featured in Special Editions
- Locality
- Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada
- Formula
- KFe2+3(Si3Al)O10(OH)2
- Size
- 4 x 3 x 2 cm - Miniature
Dark black crystals to 1.7cm, which would usually be called biotite. Most "biotites" are in fact Annite. The crystal on the second photo is pseudohexagonal.
Annite is the iron rich, OH end member, of the Biotite- Phlogopite series. Common in schists, worldwide, occuring up to 3meters (!!) as crystals in granites of Cape Ann near Rockport, Mass. USA, and crystals up to 15cm from MSH (Bernard & Hrysl). Sometimes forming pseudohexagonal outlines, and foliated masses, in Mg poor igneous and metamorphc rocks.
Phyllosilicate Mica group member. Ordinary (True or Common) Mica - Trioctahderal. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.
- Availability
- Available
- Price
- $35.00
- Featured
- Featured in Special Editions
- Locality
- Redruth, Cornwall, England
- Formula
- KFe2+3(Si3Al)O10(OH)2
- Size
- 7 x 5.5 x 3 cm - Sm Cabinet
Bronzy black Annite flakes throughout mass.
Biotite has historically been treated as an individual mineral species by geologist. Rieder et. al in the Canadian Mineralogist v. 36 (1998), reclassified and placed Biotite within the Annite-Phlogopite series.
Biotite is a phyllosilicate of the Mica group and is classified as an ordinary (True or Common) mica meaning it has flexible cleavage plates. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.
- Availability
- Available
- Price
- $30.00
- Featured
- Featured in Special Editions
- Locality
- Sheep Creek, Ravalli Co., Montana, United States
- Formula
- KFe2+3(Si3Al)O10(OH)2
- Size
- 14 x 8 x 1 cm - Cabinet
A large plate of black to golden black "biotite". Biotite is not a distinct species but falls within the Annite-Phlogopite series.
- Availability
- Available
- Price
- $35.00
- Locality
- Arechuybo, Chihuahua, Mexico
- Formula
- Sb
- Size
- 3.2 x 2.6 x 1.7 cm - Miniature
- Tagged
- native element
Crystalline native Antiomony.
- Availability
- Available
- Price
- $650.00
- Reduced Price
- $395.00
- Locality
- Enna, Sicily, Italy
- Formula
- CaCO3
- Size
- 22 x 10 x 8.5 cm - Cabinet
- Tagged
- carbonate
Large beautiful specimn with "balls" covered by tiny Aragonite crystals with a core of Sulfur.
- Availability
- Available
- Price
- $95.00
- Locality
- Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada
- Formula
- NaNa2(Fe2+4Fe3+)Si8O22(OH)2
- Size
- 4 x 2.5 x 1.5 cm - Miniature
A single large crystal with very nice termination.
