Huttonite

thorite

cheralite

Formula: Th(SiO4)
Nesosilicate (insular SiO4 groups), dimorph of thorite, monazite group. Huttonite forms solid solution series with monazite and with cheralite (Lauf p66).
Specific gravity: 7.1
Hardness: 5
Streak: White
Colour: Colourless to very pale cream, pale greenish
Environments

Plutonic igneous environments
Pegmatites
Sedimentary environments

Huttonite is rare compared to its dimorph, thorite. Huttonite is the high temperature dimorph, with the transition occurring at about 1225oC (AM 49.782-785). Huttonite is rarely metamict, although thorite usually is (Lauf p66).

In the Santa Maria de Itabira district, Minas Gerais, Brazil, huttonite occurs in a granite pegmatite (Lauf p66).

At the type locality, Gillespie's Beach, Westland District, West Coast Region, New Zealand, huttonite occurs as grains less than 2mm across (AJM 19.2.31), associated with scheelite, titanium-rich cassiterite, uranium-rich thorite, ilmenite and gold (HOM).

At Brevik, Norway, huttonite occurs in nepheline syenite (Lauf p66).

At Bogatynia, Poland, huttonite occurs in a granite pegmatite (Lauf p66) associated with cheralite and thorium-rich ningyoite (HOM).

Common impurities: U,TR,Fe,Mn,Ca,F,OH

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