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The principal uranium ores generally classified in this heading are :
(a) Autunite, hydrated phosphate of uranium and calcium. (b) Brannerite, uranium titanate. (c) Carnotite, hydrated vanadate of uranium and potassium. (d) Coffinite, uranium silicate. (e) Davidite, uranium iron titanate. (f) Parsonsite, hydrated phosphate of uranium and lead. (g) Pitchblende and uraninite, saline uranium oxides. (h) Torbernite (or chalcolite), hydrated phosphate of uranium and copper. (ij) Tyuyamunite, hydrated vanadate of uranium and calcium. (k) Uranophane, calcium‑uranium silicate. (l) Uranothorianite, oxide of uranium and thorium. The principal thorium ores generally classified in this heading are : (a) Monazite, phosphate of thorium and rare earths. (b) Thorite, hydrated thorium silicate. The heading excludes those products known in trade as "concentrates" of uranium which are obtained by processes not normal to the metallurgical industry (heading 28.44).
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