











Collectible Mineral Specimens Under $50
- 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
- $50.00
- Locality
- Fianel mine, Ausserferrera, Ferrera, Viamala, Grisons, Switzerland
- Formula
- MnV5+2O6·4H2O
- Size
- 2.5 x 2 x 1.3 cm - Thumbnail
- Tagged
- vanadium
- Special Info
- Type Locality
Rusty red coatings on matrix. Fairly rare.
- Availability
- Sold
- Locality
- Marga, Romania
- Formula
- □Mg7Si8O22(OH)2
- Size
- 5.5 x 3.5 x 3 cm - Sm Cabinet
White to tan and rusty orange, soft, fibrous radiating crystals to 2cm.
- Availability
- Sold
- Locality
- Vermillion mine, Sudbury, Ontario, Canada
- Formula
- Ni18Bi3AsS16
- Size
- 1.3 x 1 x 0.8 cm - Thumbnail
- Tagged
- sulfide, nickel. bismuth
The specimen was originally labelled as Bismutohauchecornite, but I am more inclined to call it Arsenohauchecornite based upon the brassy color and Bismutohauchecornite has not been reported from the Vermillion mine. The specimen sawed flat on two sides indicating it was probably worked on.
- Availability
- Sold
- Locality
- Majuba Hill mine, Pershing Co., Nevada, United States
- Formula
- CuFe3+2(AsO4)2(OH)2·4H2O
- Size
- 3 x 2.5 x 2.5 cm - Thumbnail
- Tagged
- arsenate, copper
Bright green crystal aggregates in round groups to 1mm.
- Availability
- Sold
- Locality
- Hidden Treasure mine, Tooele Co., Utah, United States
- Formula
- Zn5(CO3)2(OH)6
- Size
- 4.5 x 3.7 x 1.5 cm - Miniature
- Tagged
- carbonate
Bluish green Aurichalcite with colorless Hemimorphite.