Mineral Specimen and Product Inventory Search
- 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
- $40.00
- Locality
- Penberthy Croft mine, St. Hilary, Cornwall, England
- Formula
- Cu3PbO(AsO3OH)2(OH)2
- Size
- 4 x 3 x 3 cm - Miniature
- Tagged
- arsenate, copper
Grass green micro crystals on Quartz.
- Availability
- Available
- Price
- $45.00
- Locality
- Wheal Gorland, St. Day dist., Cornwall, England
- Formula
- Cu2Al7(AsO4)4(OH)13ยท12H2O
- Size
- 7 x 4.5 x 2 cm - Sm Cabinet
- Tagged
- arsenate, copper
Light blue coatings.
- Availability
- Available
- Price
- $35.00
- Locality
- East Gunnislake mine, Gunnislake, Calstock, Cornwall, England
- Formula
- Cu2PO4(OH)
- Size
- 7 x 3.5 x 4 cm - Sm Cabinet
- Tagged
- phosphate, copper
A good representative specimen of micro Libethenite crystals from this classic Cornish locality.
- 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.
- Availability
- Available
- Price
- $85.00
- Locality
- Wheal Kitty & Penhalls, United mine, St Agnes, Cornwall, England
- Formula
- Al2SiO4F2
- Size
- 3.6 x 3 x 3 cm - Miniature
A pleasant faint green gemmy Topaz crystal with six faces. One face has interesting growth hillock patters. The base is cleaved showing nicely the basal cleavage Topaz crystals posses.
