Bellbergite

bellbergite

pyrrhotite

thomsonite-(Ca)

ettringite

Images

Formula: (K,Ba,Sr)2Sr2Ca2(Ca,Na)4(Si,Al)36O72.30H2O
Tectosilicate (framework silicate), zeolite group
Specific gravity: 2.2
Hardness: 5
Streak: White
Colour: Colourless to white
Environments

Volcanic igneous environments

Localities

At the type locality, the Bellerberg volcano, Vordereifel, Mayen-Koblenz District, Rhineland-Palatinate, Germany, bellbergite occurs at the contacts of calcium-rich xenoliths in leucite tephrite. Cavities in the hybrid zone are lined with crystals of sanidine, clinopyroxene and altered pyrrhotite, on which bellbergite and spheres of thomsonite-(Ca) were deposited and succeeded by tufts of ettringite (AM 79.570). Other associates of bellbergite include willhendersonite, gismondine, jasmundite, mayenite, chlormayenite, srebrodolskite, calcio-olivine and portlandite (HOM, Mindat).

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