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Tourmaline :: Tourmaline (n.) A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels..

Nest :: Nest (n.) An aggregated mass of any ore or mineral, in an isolated state, within a rock..

Bromyrite :: Bromyrite (n.) Silver bromide, a rare mineral; -- called also bromargyrite..

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..

Melilite :: Melilite (n.) A mineral occurring in small yellow crystals, found in the lavas (melilite basalt) of Vesuvius, and elsewhere..

Bitumen :: Bitumen (n.) By extension, any one of the natural hydrocarbons, including the hard, solid, brittle varieties called asphalt, the semisolid maltha and mineral tars, the oily petroleums, and even the light, volatile naphthas..

Mineralogy :: Mineralogy (n.) The science which treats of minerals, and teaches how to describe, distinguish, and classify them..

Zircon :: Zircon (n.) A mineral occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth. Colorless, pale-yellow or smoky-brown varieties from Ceylon are called jargon..

Cologne Earth :: Cologne earth () An earth of a deep brown color, containing more vegetable than mineral matter; an earthy variety of lignite, or brown coal..

Margarite :: Margarite (n.) A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster..

Paramorphism :: Paramorphism (n.) The change of one mineral species to another, so as to involve a change in physical characters without alteration of chemical composition..

Sylvanium :: Sylvanite (n.) A mineral, a telluride of gold and silver, of a steel-gray, silver-white, or brass-yellow color. It often occurs in implanted crystals resembling written characters, and hence is called graphic tellurium..

Chrysolite :: Chrysolite (n.) A mineral, composed of silica, magnesia, and iron, of a yellow to green color. It is common in certain volcanic rocks; -- called also olivine and peridot. Sometimes used as a gem. The name was also early used for yellow varieties of tourmaline and topaz..

Yttriferous :: Yttriferous (a.) Bearing or containing yttrium or the allied elements; as, gadolinite is one of the yttriferous minerals..

Thuringite :: Thuringite (n.) A mineral occurring as an aggregation of minute scales having an olive-green color and pearly luster. It is a hydrous silicate of aluminia and iron.

Gieseckite :: Gieseckite (n.) A mineral occurring in greenish gray six-sided prisms, having a greasy luster. It is probably a pseudomorph after elaeolite..

Hushing :: Hushing (n.) The process of washing ore, or of uncovering mineral veins, by a heavy discharge of water from a reservoir; flushing; -- also called booming..

Leadhillite :: Leadhillite (n.) A mineral of a yellowish or greenish white color, consisting of the sulphate and carbonate of lead; -- so called from having been first found at Leadhills, Scotland..

Mineralize :: Mineralize (v. t.) To impregnate with a mineral; as, mineralized water..

Titanitic :: Titanitic (a.) Pertaining to, or containing, titanium; as, a titanitic mineral..

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