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- 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
- Locality
- Pendarves mine, Camborne, Cornwall, England
- Formula
- SnO2
- Size
- 5.5 x 4.5 x 2 cm - Sm Cabinet
- Tagged
- tin
A good representative specimen of Cassiterite to 5mm.
- Availability
- Available
- Price
- $30.00
- Locality
- Gunheath China Clay Pit, St. Austell, Cornwall, England
- Formula
- NaFe2+3Al6(BO3)3Si6O18(OH)4
- Size
- 6 x 4 x 2 cm - Sm Cabinet
This is just a locality specimen with crystals of Schorl to 2cm.