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Galena :: Galena (n.) Lead sulphide; the principal ore of lead. It is of a bluish gray color and metallic luster, and is cubic in crystallization and cleavage..

Pyramidal :: Pyramidal (a.) Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage..

Cubical :: Cubical (a.) Isometric or monometric; as, cubic cleavage. See Crystallization..

Fluorite :: Fluorite (n.) Calcium fluoride, a mineral of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor..

Hypersthene :: Hypersthene (n.) An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface..

Cleavage :: Cleavage (n.) The act of cleaving or splitting.

Parting :: Parting (n.) Lamellar separation in a crystallized mineral, due to some other cause than cleavage, as to the presence of twinning lamellae..

Discoblastic :: Discoblastic (a.) Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg..

Octahedral :: Octahedral (a.) Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage..

Ectolecithal :: Ectolecithal (a.) Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova..

Secondary :: Secondary (a.) Subsequent in origin; -- said of minerals produced by alteertion or deposition subsequent to the formation of the original rocks mass; also of characters of minerals (as secondary cleavage, etc.) developed by pressure or other causes..

Cleavage :: Cleavage (n.) Division into laminae, like slate, with the lamination not necessarily parallel to the plane of deposition; -- usually produced by pressure..

Bismuth :: Bismuth (n.) One of the elements; a metal of a reddish white color, crystallizing in rhombohedrons. It is somewhat harder than lead, and rather brittle; masses show broad cleavage surfaces when broken across. It melts at 507¡ Fahr., being easily fused in the flame of a candle. It is found in a native state, and as a constituent of some minerals. Specific gravity 9.8. Atomic weight 207.5. Symbol Bi..

Orthotomous :: Orthotomous (a.) Having two cleavages at right angles with one another.

Apophyllite :: Apophyllite (n.) A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It is a hydrous silicate of calcium and potassium..

Segmentation :: Segmentation (n.) The act or process of dividing into segments; specifically (Biol.), a self-division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation..

Foliation :: Foliation (n.) The property, possessed by some crystalline rocks, of dividing into plates or slabs, which is due to the cleavage structure of one of the constituents, as mica or hornblende. It may sometimes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure..

Morulation :: Morulation (n.) The process of cleavage, or segmentation, of the ovum, by which a morula is formed..

Fissile :: Fissile (a.) Capable of being split, cleft, or divided in the direction of the grain, like wood, or along natural planes of cleavage, like crystals..

Cronstedtite :: Cronstedtite (n.) A mineral consisting principally of silicate of iron, and crystallizing in hexagonal prisms with perfect basal cleavage; -- so named from the Swedish mineralogist Cronstedt..

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