Weberite

halide

pegmatite

Formula: Na2MgAlF7
Halide
Specific gravity: 2.96
Hardness: 3½
Streak: White
Colour: Greyish white; colourless in transmitted light.
Solubility: Slightly soluble in water. Readily soluble in an AlCl3 solution (Mindat).
Environments

Pegmatites

Weberite occurs with cryolite and other fluorides (Webmin).

At the type locality, the Ivigtut Cryolite deposit, Sermersooq, Greenland, Denmark, weberite occurs in a cryolite deposit and overlying pegmatite associated with cryolite, chiolite, jarlite, stenonite, thomsenolite, prosopite, pachnolite, hydrokenoralstonite, fluorite, topaz, potassian mica, pyrite, quartz, feldspar, siderite and galena (HOM, Mindat, AM24.278).

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