Annite

#PD57608

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.

Annite at Dakota Matrix Annite at WebMineral Annite at MinDat

Aragonite var, ktypeite

#BW64209

Availability: Available
Price: $25.00

Locality: Huelva, Andalusia, Spain
Formula: CaCO₃
Size: 4.5 x 2.5 x 2 cm - Miniature
Tagged: carbonate

Cool oolitic Aragonite, variety ktypeite.

Aragonite at Dakota Matrix Aragonite at WebMineral Aragonite at MinDat

Argyrodite in Rhodochrosite

#65563

SOLD

Availability: Sold

Locality: Santa Rita vein, Capillita dist., Andalgalá, Catamarca, Argentina
Formula: Ag₈GeS₆
Size: 2 x 1.4 x 1 cm - Thumbnail
Tagged: sulfide, silver

Three metallic black grains to 2.5mm in Rhodochrosite matrix.

Argyrodite at Dakota Matrix Argyrodite at WebMineral Argyrodite at MinDat

Arsenopyrite with Pyrite

#BAC64023

Availability: Available
Price: $25.00

Locality: Panasqueira, Covilha, Amazonas, Brazil
Formula: FeAsS
Size: 4.5 x 2 x 2.5 cm - Miniature
Tagged: sulfide

Bladed crystals of Arsenopyrite to 2cm long with a second generation of cockscomb habit Arsenopyrite. There are also numberous micro, cubic crystals of Pyrite. It is quite interesting.

Arsenopyrite at Dakota Matrix Arsenopyrite at WebMineral Arsenopyrite at MinDat