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Bipyramidal :: Bipyramidal (a.) Consisting of two pyramids placed base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals..

Iriscope :: Iriscope (n.) A philosophical toy for exhibiting the prismatic tints by means of thin films.

Zoisite :: Zoisite (n.) A grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and lime, and is allied to epidote..

Pyroxene :: Pyroxene (n.) A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90�, 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. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basa

Camera Lucida :: Camera lucida () An instrument which by means of a prism of a peculiar form, or an arrangement of mirrors, causes an apparent image of an external object or objects to appear as if projected upon a plane surface, as of paper or canvas, so that the outlines may conveniently traced. It is generally used with the microscope..

Refringent :: Refringent (a.) Pertaining to, or possessing, refringency; refractive; refracting; as, a refringent prism of spar..

Crayon :: Crayon (n.) An implement for drawing, made of clay and plumbago, or of some preparation of chalk, usually sold in small prisms or cylinders..

Diprismatic :: Diprismatic (a.) Doubly prismatic.

Topaz :: Topaz (n.) A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem..

Yenite :: Yenite (n.) A silicate of iron and lime occurring in black prismatic crystals; -- also called ilvaite.

Macropyramid :: Macropyramid (n.) See Macroprism.

Iceland Spar :: Iceland spar () A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction. Cf. Calcite..

Iridescence :: Iridescence (n.) Exhibition of colors like those of the rainbow; the quality or state of being iridescent; a prismatic play of color; as, the iridescence of mother-of-pearl..

Cylinder :: Cylinder (n.) The revolving square prism carrying the cards in a Jacquard loom.

Parallelopiped :: Parallelopiped (n.) A solid, the faces of which are six parallelograms, the opposite pairs being parallel, and equal to each other; a prism whose base is a parallelogram..

Dihexagonal :: Dihexagonal (a.) Having twelve similar faces; as, a dihexagonal prism..

Macrodiagonal :: Macrodiagonal (n.) The longer of two diagonals, as of a rhombic prism. See Crystallization..

Tourmaline :: Tourmaline (n.) A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels..

Ilvaite :: Ilvaite (n.) A silicate of iron and lime occurring in black prismatic crystals and columnar masses.

Brachydiagonal :: Brachydiagonal (n.) The shorter of the diagonals in a rhombic prism.

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