Specific gravity: 2.96
Colour: Greyish white; colourless in transmitted light.
Solubility: Slightly soluble in water. Readily soluble in an AlCl3 solution (Mindat).
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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