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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

ammonite--The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns.

ammonite--The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns.

Worlds Largest Amethyst Geode

Worlds Largest Amethyst Geode

Biotite. Alemania. Www.geologyin.com

Biotite. Alemania. Www.geologyin.com

Biotite, The Wannenköpfe, Ochtendung, Eifel region, Germany. Fov 1.5 mm. Copyright: 	Fred Kruijen

Biotite, The Wannenköpfe, Ochtendung, Eifel region, Germany. Fov 1.5 mm. Copyright: Fred Kruijen

Phlogopite  - Ampandandrava, Beraketa, Tulear Province, Madagascar  / Spirifer Minerals

Phlogopite - Ampandandrava, Beraketa, Tulear Province, Madagascar / Spirifer Minerals

Biotite The Wannenköpfe, Ochtendung, Eifel region, Germany Taille=2 mm Photo / collection Fred Kruijen

Biotite The Wannenköpfe, Ochtendung, Eifel region, Germany Taille=2 mm Photo / collection Fred Kruijen

Polylithionite from Darai-Pioz Glacier (Dara-i-Pioz; Dara-Pioz), Alai Range…

Polylithionite from Darai-Pioz Glacier (Dara-i-Pioz; Dara-Pioz), Alai Range…

Fluorophlogopite, KMg3(AlSi3)O10F2, Arebilovskoe phlogopite deposit, Aldan, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. Specimen size is 3.5x2.5x0.8 cm. Copyright: 	© Pavel M. Kartashov

Fluorophlogopite, KMg3(AlSi3)O10F2, Arebilovskoe phlogopite deposit, Aldan, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. Specimen size is 3.5x2.5x0.8 cm. Copyright: © Pavel M. Kartashov

Zinnwaldite, KLiFeAl(AlSi3)O10(OH,F)2, Locality: Cínovec / Zinnwald (Cinvald), Erzgebirge; Krusné Hory Mts, Saxony & Ústí Region (Bohemia; Böhmen; Boehmen), Germany & Czech Republic.  size 8x6 cm

Zinnwaldite, KLiFeAl(AlSi3)O10(OH,F)2, Locality: Cínovec / Zinnwald (Cinvald), Erzgebirge; Krusné Hory Mts, Saxony & Ústí Region (Bohemia; Böhmen; Boehmen), Germany & Czech Republic. size 8x6 cm

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