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Plagioclase

Locality: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia

Note: The mineral species Plagioclase is not listed in our database for this locality. This specimen may be misidentified or the mindat list of minerals at this locality may be incomplete.

A mineral collectors dream: Crystal rain: A ball of platy crystals of plagioclase ejected as crystal lapillus from the 1975-1976 eruption of the Large Fissure of the Tolbachik volcano during an explosive eruption. The crystals are somewhat damaged from the fall. The crystals are covered by a thin crust of volcanic glass. The plagioclase are mixtures of anorthite-albite. The anorthite contence can be rather low. Bolshoe treshinnoe Tolbachinskoe izverkhenie, by S.A. Fedotov, 1984, page 242 states that the Lapilli consist of 20 to 80% of anorthite. Most of the feldspar of the lapilli are zoned. Specimen size: 2,3 cm. The specimen was provided by the Russian mineralogist Pavel M. Kartashov, and it is now in the collection of OT. Ljostad.

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Photo added: 24th Nov 2004

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