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

Gang :: Gang (v. i.) The mineral substance which incloses a vein; a matrix; a gangue.

Molybdenite :: Molybdenite (n.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum..

Exfoliation :: Exfoliation (n.) The scaling off of a bone, a rock, or a mineral, etc.; the state of being exfoliated..

Oxalite :: Oxalite (n.) A yellow mineral consisting of oxalate of iron.

Gypsum :: Gypsum (n.) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety..

Lanthanum :: Lanthanum (n.) A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La..

Ludlamite :: Ludlamite (n.) A mineral occurring in small, green, transparent, monoclinic crystals. It is a hydrous phosphate of iron..

Boncilate :: Boncilate (n.) A substance composed of ground bone, mineral matters, etc., hardened by pressure, and used for making billiard balls, boxes, etc..

Septarium :: Septarium (n.) A flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals..

Kingdom :: Kingdom (n.) An extensive scientific division distinguished by leading or ruling characteristics; a principal division; a department; as, the mineral kingdom..

Jamesonite :: "Jamesonite (n.) A steel-gray mineral, of metallic luster, commonly fibrous massive. It is a sulphide of antimony and lead, with a little iron..

Franklinite :: Franklinite (n.) A kind of mineral of the spinel group.

Pyrosmalite :: Pyrosmalite (n.) A mineral, usually of a pale brown or of a gray or grayish green color, consisting chiefly of the hydrous silicate of iron and manganese; -- so called from the odor given off before the blowpipe..

Strontic :: Strontianite (n.) Strontium carbonate, a mineral of a white, greenish, or yellowish color, usually occurring in fibrous massive forms, but sometimes in prismatic crystals..

Monazite :: Monazite (n.) A mineral occurring usually in small isolated crystals, -- a phosphate of the cerium metals..

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..

Thomsonite :: Thomsonite (n.) A zeolitic mineral, occurring generally in masses of a radiated structure. It is a hydrous silicate of aluminia, lime, and soda. Called also mesole, and comptonite..

Chessy Copper :: Chessy copper () The mineral azurite, found in fine crystallization at Chessy, near Lyons; called also chessylite..

Determination :: Determination (n.) The act of determining the relations of an object, as regards genus and species; the referring of minerals, plants, or animals, to the species to which they belong; classification; as, I am indebted to a friend for the determination of most of these shells..

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