Mineral mining

Mineral mining

The extraction of valuable minerals or other geological materials from the earth for economic interests.

Industry: Mining

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Mineral mining

chameleonite

Mining; General mining

A rare variety of tourmaline, olive green in daylight, changing to brownish-red in most artificial light.

alexandritelike tourmaline

Mining; General mining

A rare variety of tourmaline, olive green in daylight, changing to brownish-red in most artificial light.

A rare, silvery-white metal. Symbol, Re. Occurs in very small quantities in platinum ores and in columbite, gadolinite, and molybdenite. Used for filaments for mass spectrographs and ion gages; for ...

synchisite

Mining; General mining

A rare, weakly radioactive, orthorhombic or monoclinic mineral, Ca(Ce,Nd,Y,La)(CO 3 ) 2 F , usually found in pegmatites associated with aegirite, microcline, astrophyllite, fluorite, gadolinite, ...

ytterbium

Mining; General mining

A rare-earth element that has a bright silvery luster, is soft, malleable and quite ductile. Symbol, Yb. Occurs with other rare-earths in a number of rare minerals. Commercially recovered from ...

yttrium

Mining; General mining

A rare-earth element that has a silvery-metallic luster. Symbol, Y. Occurs in nearly all of the rare-earth minerals. Recovered commercially from monazite sand and from bastnasite. Widely used: in ...

dysprosium oxide

Mining; General mining

A rare-earth oxide; white; Dy 2 O 3 ; isometric; sp gr, 7.81 (at 27 degrees C); and melting point, 2,340+ or -10 degrees C. Used as a nuclear-reactor control-rod component and a neutron-density ...