Mineral Specimen and Product Inventory Search

Availability

Available

Price

$35.00

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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.