Ye'elimite

ye'elimite

larnite

brownmillerite

ellestadite

Images

Formula: Ca₄Al₆O₁₂(SO₄ )
Sulphate
Crystal System: Isometric
Specific gravity: 2.61 calculated
Colour: Colourless
Solubility: Decomposes in water to give ettringite and Al(OH)₃
Environments

Metamorphic environments

Localities

At the type locality, Har Ye'elim, Dead Sea, Southern District, Israel, ye'elimite is found in "cobbles" in a "pseudo-conglomerate"(the "cobbles" are fragments of high-temperature metamorphic mineral assemblages). The rock is approximately 40% larnite, 25% brownmillerite, 20% ellestadite and 15% ye'elimite. Crystals of ye'elimite normally range from 3 to 15 microns, but larger ones up to 60 microns have been observed. It was found in samples heated above about 900^oC, and so it is considered to be in the sanidinite facies (AM 72.226-227).
Fluorapatite is also asssociated with ye'elimite (Mindat).

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