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Biotite,  	K(Mg,Fe++)3[AlSi3O10(OH,F)2 , In den Dellen Quarries, Niedermendig, Mendig, Eifel Mountains, Germany

Biotite, K(Mg,Fe++)3[AlSi3O10(OH,F)2 , In den Dellen Quarries, Niedermendig, Mendig, Eifel Mountains, Germany

Biotite,  	K(Mg,Fe++)3[AlSi3O10(OH,F)2, In den Dellen Quarries, Niedermendig, Mendig, Eifel Mountains, Germany. Largest crystal size 3.5 mm. Copyright: © Volker Betz

Biotite, K(Mg,Fe++)3[AlSi3O10(OH,F)2, In den Dellen Quarries, Niedermendig, Mendig, Eifel Mountains, Germany. Largest crystal size 3.5 mm. Copyright: © Volker Betz

Phlogopite ~ San Vito Quarry, Mount Vesuvius, Campania, Italy

Phlogopite ~ San Vito Quarry, Mount Vesuvius, Campania, Italy

Biotite,  	K(Mg,Fe++)3[AlSi3O10(OH,F)2 , In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic, Eifel, Germany.

Biotite, K(Mg,Fe++)3[AlSi3O10(OH,F)2 , In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic, Eifel, Germany.

Phlogopite on Calcite, Arandis, Swakopmund, Erongo Region, Namibia. Pseudohexagonal lustrous black crystals up to 3cm displaying stepped habit prism faces, and terminations. On pinkish Calcite matrix.

Phlogopite on Calcite, Arandis, Swakopmund, Erongo Region, Namibia. Pseudohexagonal lustrous black crystals up to 3cm displaying stepped habit prism faces, and terminations. On pinkish Calcite matrix.

Biotite. Alemania. Www.geologyin.com

Biotite. Alemania. Www.geologyin.com

Zinnwaldite, KLiFe2+Al(AlSi3O10)(F,OH)2 Cínovec / Zinnwald, Erzgebirge; Krusné Hory Mts, Saxony & Ústí Region, Germany & Czech Republic. Fov 10 mm. Copyright © Vítězslav Snášel

Zinnwaldite, KLiFe2+Al(AlSi3O10)(F,OH)2 Cínovec / Zinnwald, Erzgebirge; Krusné Hory Mts, Saxony & Ústí Region, Germany & Czech Republic. Fov 10 mm. Copyright © Vítězslav Snášel

Large biotite aggregate

Large biotite aggregate

Worlds largest amethyst!

Worlds largest amethyst!

Palasita, meteorito de olivina e níquel ferro

Palasita, meteorito de olivina e níquel ferro

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