Thorium dioxide mineral (ThO2) that may be very heavy, onerous, and coloured
darkish grey to brownish black or bluish black. Initially found as waterworn
grains and crystals in the gem gravels of Ceylon (now Sri Lanka), thorianite
additionally happens sparsely within the black river and seaside sands of
Alaska, Madagascar, and Siberia. The refractory nature and shortage of
thorianite have restricted its commercial use as a source of thorium. It
varieties a strong-solution series with uraninite through which uranium atoms
replace thorium atoms within the crystal structure. Rare earths and radiogenic
lead and helium are sometimes present. Varieties containing a lot uranium have
been present in pegmatites in Quebec and Ontario and in serpentine at Easton,
Pa.
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