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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