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Having six sides and six angles; six-sided. Hexagonal system. (Crystal.) See under Crystallization.

In an hexagonal manner.

Consisting of two hexagonal parts united; thus, a dihexagonal pyramid is composed of two hexagonal pyramids placed base to base.

A mineral of great hardness, and, when transparent, of much beauty. It occurs in hexagonal prisms, commonly of a green or bluish green color, but also yellow, pink, and white. It is a silicate of aluminium and glucinum (beryllium). The aquamarine is a transparent, sea-green variety used as a gem. The emerald is another…

A mineral occurring in hexagonal crystals, also massive, generally of a yellow color, containing silica, alumina, lime, soda, and carbon dioxide.

tc. Another modification is graphite, or blacklead, and in this it is soft, and occurs in hexagonal prisms or tables. When united with oxygen it forms carbon dioxide, commonly called carbonic acid, or carbonic oxide, according to the proportions of the oxygen; when united with hydrogen, it forms various compounds calle…

, having free reeds on the inside, and keys and handles on the outside of each of the two hexagonal heads.

A mineral consisting principally of silicate of iron, and crystallizing in hexagonal prisms with perfect basal cleavage; -- so named from the Swedish mineralogist Cronstedt.

A tile or flagstone cut into an hexagonal shape to produce a honeycomb pattern, as in a pavement; -- called also favas and sectila. Mollett.

Native carbon in hexagonal crystals, also foliated or granular massive, of black color and metallic luster, and so soft as to leave a trace on paper. It is used for pencils (improperly called lead pencils), for crucibles, and as a lubricator, etc. Often called plumbago or black lead. Graphite battery (Elec.), a voltaic…

Native cadmium sulphide, a mineral occurring in yellow hexagonal crystals, also as an earthy incrustation.

A mass of hexagonal waxen cells, formed by bees, and used by them to hold their honey and their eggs.

he directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.

A variety of mimetite or arseniate of lead in hexagonal prisms of a fine orange yellow. [Written also campylite.]

A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.

ome to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite.

Native lead phosphate with lead chloride, occurring in bright green and brown hexagonal crystals and also massive; -- so called because a fused globule crystallizes in cooling.

A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.…

The second stomach of ruminants, in which folds of the mucous membrane form hexagonal cells; -- also called the honeycomb stomach.

al iron ore (Min.) See Hematite. -- Rhombohedral system (Crystallog.), a division of the hexagonal system embracing the rhombohedron, scalenohedron, etc.