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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..

Orthoclase :: Orthoclase (n.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

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..

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..

Euclase :: Euclase (n.) A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina..

Acrotomous :: Acrotomous (a.) Having a cleavage parallel with the base.

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

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..

Prismatical :: Prismatical (a.) Resembling, or pertaining to, a prism; as, a prismatic form or cleavage..

Fission :: Fission (n.) A method of asexual reproduction among the lowest (unicellular) organisms by means of a process of self-division, consisting of gradual division or cleavage of the into two parts, each of which then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ, undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division, under Division..

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..

Diatomous :: Diatomous (a.) Having a single, distinct, diagonal cleavage; -- said of crystals..

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..

Schizo- :: Schizo- () A combining form denoting division or cleavage; as, schizogenesis, reproduction by fission or cell division..

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

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

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

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..

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..

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..

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