thorianite


Also found in: Dictionary, Wikipedia.

thorianite

[′thȯr·ē·ə‚nīt]
(mineralogy)
ThO2 A radioactive mineral that crystallizes in the isometric system, occurs in worn cubic crystals, is brownish black to reddish brown in color, and has resinous luster; hardness is 7 on the Mohs scale, and specific gravity is 9.7-9.8.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Associated minerals are: dolomite, fluororichterite, chromite, thorianite, forsterite and phlogopite.
Included were Madagascar rare-earth classics like sharp betafite crystals to 4 cm; well-composed earthy brown sprays of 2-cm euxenite crystals; swarms of loose 1 and 2-cm cubes of lustrous black thorianite; and allanite crystal groups from Madagascar and from Alto Ligonha, Mozambique.
Behier wrote a mineralogy of Mozambique (1957) and a supplement to the mineralogy of Madagascar (1960); consequently his collection was strong in Madagascar minerals, including tourmaline, betafite, thorianite, and other pegmatite species.
Melanocerite, ortholavenite, loparite, thorite, thorianite, eudialyte, perrierite, chevkinite, zircon, leucophanite, catapleiite, astrophyllite, tainiolite, calcium-rich seidozerite are found in nepheline-albite phenites at the exocontact.
Thorianite has been identified from the Namivo-Tomeia-Nampoca group of pegmatites (DSGM, 1974).