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Gieseckite :: Gieseckite (n.) A mineral occurring in greenish gray six-sided prisms, having a greasy luster. It is probably a pseudomorph after elaeolite..

Spectrum :: Spectrum (n.) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope..

Prism :: Prism (n.) A form the planes of which are parallel to the vertical axis. See Form, n., 13..

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

Diamond :: Diamond (n.) A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness..

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

Iridescent :: Iridescent (a.) Having colors like the rainbow; exhibiting a play of changeable colors; nacreous; prismatic; as, iridescent glass..

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..

Prismatic :: Prismatic (a.) Alt. of Prismatica.

Duct :: Duct (n.) A large, elongated cell, either round or prismatic, usually found associated with woody fiber..

Stibonium :: Stibnite (n.) A mineral of a lead-gray color and brilliant metallic luster, occurring in prismatic crystals; sulphide of antimony; -- called also antimony glance, and gray antimony..

Iris :: Iris (n.) An appearance resembling the rainbow; a prismatic play of colors.

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

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..

Macroprism :: Macroprism (n.) A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.

Prismatoidal :: Prismatoidal (a.) Having a prismlike form.

Traject :: Traject (v. t.) To throw or cast through, over, or across; as, to traject the sun's light through three or more cross prisms..

Prismatically :: Prismatically (adv.) In the form or manner of a prism; by means of a prism.

Goethite :: Goethite (n.) A hydrous oxide of iron, occurring in prismatic crystals, also massive, with a fibrous, reniform, or stalactitic structure. The color varies from yellowish to blackish brown..

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..

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