Thorianite is a rare mineral and may contain up to about 12 % thorium oxide.
2.
Thorium dioxide occurs as the rare mineral thorianite, which usually contains up to 12 % ThO 2.
3.
Thorium occurs in several minerals including thorite ( ThSiO 4 ), thorianite ( ThO 2 + UO 2 ) and monazite.
4.
Thorium ( IV ) chloride does not appear naturally but instead is derived from Thorite, Thorianite, or Monazite which are naturally occurring formations.
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