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ad. It is of a bluish gray color and metallic luster, and is cubic in crystallization and cleavage. False galena. See Blende.

amygdaloid, in foliated masses, and also in monoclinic crystals with pearly luster on the cleavage face. It is a hydrous silicate of alumina and lime.

rayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface.

Directed to the side; as, a lateral view of a thing. Lateral cleavage (Crystallog.), cleavage parallel to the lateral planes. -- Lateral equation (Math.), an equation of the first degree. [Obs.] -- Lateral line (Anat.), in fishes, a line of sensory organs along either side of the body, often marked by a distinct line…

The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, and vary in color from pale brown or yellow to green or black. The transparent forms are used in lanterns, the doors of stoves, etc., be…

Having a distinct cleavage in a single direction only.

The process of cleavage, or segmentation, of the ovum, by which a morula is formed.

Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage. Octahedral borax (Chem.), borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or prismatic borax. -- Octahedral iron ore (…

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

Having two cleavages at right angles with one another.

Lamellar separation in a crystallized mineral, due to some other cause than cleavage, as to the presence of twinning lamellæ.

Resembling, or pertaining to, a prism; as, a prismatic form or cleavage.

Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage. The mystic obelisks stand up Triangular, pyramidal. Mrs. Browning.

rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called also dialogite.

A combining form denoting division or cleavage; as, schizogenesis, reproduction by fission or cell division.

sporozoite or merozoite (in a cell or corpuscle of the host) which segment by superficial cleavage, without encystment or conjugation, into merozoites.

to the formation of the original rocks mass; also of characters of minerals (as secondary cleavage, etc.) developed by pressure or other causes.

One of the cells or division formed by segmentation, as in egg cleavage or in fissiparous cell formation.

segments; specifically (Biol.), a self-division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. Segmentation cavity (Biol.), the cavity formed by the arrangement of the cells in segmentation or cleavage of the ovum; the cavity of the blastosphere. In the gastrula stag…

llel plates, capable of being separated by splitting; as, a slaty color or texture. Slaty cleavage (Min.), cleavage, as of rocks, into thin leaves or plates, like those of slate; -- applied especially to those cases in which the planes of cleavage are not parallel to the planes of stratification. It is now believed to…