coffinite


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coffinite

[′kȯf·ə‚nīt]
(mineralogy)
USiO4 A black silicate important as a uranium ore; found in sandstone deposits and hydrothermal veins in New Mexico, Utah, and Wyoming.
References in periodicals archive ?
The primary uranium minerals are uraninite and coffinite but numerous secondary uranium minerals have been formed as a result of the weathering processes: yellow gummites, autunite, metaautunite, torbernite, saleeite, uranotyle, ianthinite and uranopilite (Arribas, 1975).
Uraninite and occasionally coffinite are the U(IV) phases present in the veins and fractures throughout the system, whereas U(VI)-phosphates and gummites are found in shallow weathered zones of borehole SR4 and the Southern Fault.
No coffinite is assumed to be precipitated in the reducing part of the system.
The cataclastites in the central part of the deposit are sometimes enriched in graphite and sulphides, and host uranium mineralization enriched in coffinite, partly also pitchblende.
8) is connected with the origin of uranium mineralization and a higher concentration of HREE in coffinite.
Uranium minerals in unoxidized formations are primarily uraninite and coffinite while oxidized formations mainly contain uranium vanadates such as carnotite, tyuyamunite and metatyuyamunite.