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lapis lazuli
lapis lazuli , gem, deep blue, violet, or greenish blue in color and usually flecked with yellow iron pyrites. It is composed of lazurite, a complex sodium aluminum silicate, mixed with other minerals, and is usually found in masses, rather than in crystals, in metamorphosed limestones. Sources of s...
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monazite
monazite , yellow to reddish-brown natural phosphate of the rare earths , mainly the cerium and lanthanum metals, usually with some thorium . Yttrium, calcium, iron, and silica are frequently present. Monazite sand is the crude natural material and is usually purified from other minerals befor...
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Colorado
Colorado , state, W central United States, one of the Rocky Mt. states. It is bordered by Wyoming (N), Nebraska (N, E), Kansas (E), Oklahoma and New Mexico (S), and Utah (W).
Facts and Figures
Area, 104,247 sq mi (270,000 sq km). Pop. (2000) 4,301,261, a 30.6% increase since the 1990 c...
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mineral
mineral inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form. A few of the minerals (e.g., carbon, arsenic, bismuth, antimony, gold, silver, copper, lead, mercury, platinum, and...
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azurite
azurite , blue mineral, the basic carbonate of copper, occurring in monoclinic crystals or masses that range from transparent to translucent and opaque. It is usually associated with malachite , which it resembles except in color; when the two minerals are very closely associated, the stone is call...
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biotite
biotite , iron-rich variety of phlogopite, most abdunant of the mica minerals.
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cleavage
cleavage tendency of many minerals to split along definite smooth planar surfaces determined by their crystal structure. The directions of these surfaces are related to weaknesses in the atomic structure of the mineral and are always parallel to a possible crystal face. The property of cleavage is ...
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flotation process
flotation process in mineral treatment and mining, process for concentrating the metal-bearing mineral in an ore . Crude ore is ground to a fine powder and mixed with water, frothing reagents, and collecting reagents. When air is blown through the mixture, mineral particles cling to the bubbles, w...
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Industrial Workers of the World
Industrial Workers of the World (IWW), revolutionary industrial union organized in Chicago in 1905 by delegates from the Western Federation of Mines, which formed the nucleus of the IWW, and 42 other labor organizations. It became the chief organization in the United States representing the doctrin...
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William Dudley Haywood
William Dudley Haywood 1869-1928, American labor leader, known as Big Bill Haywood, b. Salt Lake City, Utah. He began work as a miner at 15 years of age. In 1896 he joined the newly organized Western Federation of Miners, and in 1900 became a member of the executive board and national secretary-tre...
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