Kostylevite

Elongated colourless crystals (<1 mm) in cavity on potassian feldspar
Origin: Mt. Yuksporr, Chibiny, Kola Peninsula, Russia
Sample size: 1.5 x 2.5 cm
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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