Eylettersite

eylettersite

cyrtolite

columbite

phosphuranylite

Images

Formula: Th_0.75Al₃(PO₄)₂(OH)₆
Anhydrous phosphate containing hydroxyl, plumbogummite group, alunite supergroup, thorium-bearing mineral
Crystal System: Trigonal
Specific gravity: 3.34 to 3.38 measured, 3.47 calculated
Hardness: 3 to 4
Streak: White
Colour: cream-white
Luminescence: Fluoresces weakly underUV, brown-cream in long wave, greenish yellow in short wave
Solubility: Readily soluble in sulphuric acid
Strongly RADIOACTIVE
Environments

Pegmatites

Localities

At the type locality, the Kobokobo pegmatite, Shabunda Territory, South Kivu, DR Congo, eylettersite occurs in nodules associated with feldspar, cyrtolite, columbite, apatite and phosphuranylite (AM 59.208-212). It is an alteration product of thorian crandallite in a phosphate-rich granite (Mindat).

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