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Orpiment :: Orpiment (n.) Arsenic sesquisulphide, produced artificially as an amorphous lemonyellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing..

Cannel Coal :: Cannel coal () A kind of mineral coal of a black color, sufficiently hard and solid to be cut and polished. It burns readily, with a clear, yellow flame, and on this account has been used as a substitute for candles..

Cerite :: Cerite (n.) A mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals..

Amphibole :: Amphibole (n.) A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species). Amphibole is a constit

Magma :: Magma (n.) Any crude mixture of mineral or organic matters in the state of a thin paste.

Linnaeite :: Linnaeite (n.) A mineral of pale steel-gray color and metallic luster, occurring in isometric crystals, and also massive. It is a sulphide of cobalt containing some nickel or copper..

Microlite :: Microlite (n.) A minute inclosed crystal, often observed when minerals or rocks are examined in thin sections under the microscope..

Ore :: Ore (n.) The native form of a metal, whether free and uncombined, as gold, copper, etc., or combined, as iron, lead, etc. Usually the ores contain the metals combined with oxygen, sulphur, arsenic, etc. (called mineralizers)..

Mellitic :: Mellitic (a.) Pertaining to, or derived from, the mineral mellite..

Hauynite :: Hauynite (n.) A blue isometric mineral, characteristic of some volcani/ rocks. It is a silicate of alumina, lime, and soda, with sulphate of lime..

Hessite :: Hessite (n.) A lead-gray sectile mineral. It is a telluride of silver.

Dufrenite :: Dufrenite (n.) A mineral of a blackish green color, commonly massive or in nodules. It is a hydrous phosphate of iron..

Mineralogize :: Mineralogize (v. i.) To study mineralogy by collecting and examining minerals.

Leucoxene :: Leucoxene (n.) A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron..

Polyhalite :: Polyhalite (n.) A mineral usually occurring in fibrous masses, of a brick-red color, being tinged with iron, and consisting chiefly of the sulphates of lime, magnesia, and soda..

Mineralize :: Mineralize (v. t.) To transform into a mineral.

Bovey Coal :: Bovey coal () A kind of mineral coal, or brown lignite, burning with a weak flame, and generally a disagreeable odor; -- found at Bovey Tracey, Devonshire, England. It is of geological age of the oolite, and not of the true coal era..

Petroleum :: Petroleum (n.) Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largely of the methane series, but may vary much in appearance, composition, and properties. It is refined by distillation, and the products include kerosene, benzine, gasoline, paraffin, etc..

Condurrite :: Condurrite (n.) A variety of the mineral domeykite, or copper arsenide, from the Condurra mine in Cornwall, England..

Placer :: Placer (n.) A deposit of earth, sand, or gravel, containing valuable mineral in particles, especially by the side of a river, or in the bed of a mountain torrent..

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