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The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.

A general term used of any triclinic feldspar. See the Note under Feldspar.

sis; agglutinative. Polysynthetic twinning (Min.), repeated twinning, like that of the triclinic feldspar, producing fine parallel bands in alternately reversed positions.

A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90º, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. Th…

Triclinic.

ht about. Polysynthetic twinning, repeated twinning of crystal lamellæ, as that of the triclinic feldspars. -- Repeated twinning, twinning of more than two crystals, or parts of crystals. -- Twinning axis, Twinning plane. See the Note under Twin, n.

phosphate of iron of a blue to green color, growing darker on exposure. It occurs in monoclinic crystals, also fibrous, massive, and earthy.

Calcium oxalate, occurring in colorless or white monoclinic crystals.