Weberite

weberite

prosopite

cryolite

hydrokenoralstonite

Formula: Na2MgAlF7
Halide
Crystal System: Orthorhombic
Specific gravity: 2.96 measured, 2.966 calculated
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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