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quartz
q u a r t z hex:#113;#117;#97;#114;#116;#122;
The Salt of the World?
- Quartz - n. - 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.
- Quartziferous - a. - Consisting chiefly of quartz; containing quartz.
- Quartzite - n. - Massive quartz occurring as a rock; a metamorphosed sandstone; -- called also quartz rock.
- Quartzoid - n. - A form of crystal common with quartz, consisting of two six-sided pyramids, base to base.
- Quartzose - a. - Containing, or resembling, quartz; partaking of the nature or qualities of quartz.
- quartzous - a. - Quarzose.
- Quartzy - a. - Quartzose.
- Slickens - n. - The pulverized matter from a quartz mill, or the lighter soil of hydraulic mines.
- Opal - n. - A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
- Schist - n. - Any crystalline rock having a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The common kinds are mica schist, and hornblendic schist, consisting chiefly of quartz with mica or hornblende and often feldspar.
- Granulite - n. - A whitish, granular rock, consisting of feldspar and quartz intimately mixed; -- sometimes called whitestone, and leptynite.
- Silica - n. - Silicon dioxide, SiO/. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.
- Levorotatory - a. - Turning or rotating the plane of polarization towards the left; levogyrate, as levulose, left-handed quartz crystals, etc.
- Trapezohedron - n. - A tetartohedral solid of the hexagonal system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals.
- Smalt - v. t. - A deep blue pigment or coloring material used in various arts. It is a vitreous substance made of cobalt, potash, and calcined quartz fused, and reduced to a powder.
- Sandstone - n. - A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.
- 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.
- Crystalline - a. - Imperfectly crystallized; as, granite is only crystalline, while quartz crystal is perfectly crystallized.
- Crocidolite - n. - A mineral occuring in silky fibers of a lavender blue color. It is related to hornblende and is essentially a silicate of iron and soda; -- called also blue asbestus. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers.
- Quartzite - n. - Massive quartz occurring as a rock; a metamorphosed sandstone; -- called also quartz rock.
- Pseudomorph - n. - A pseudomorphous crystal, as a crystal consisting of quartz, but having the cubic form of fluor spar, the fluor crystal having been changed to quartz by a process of substitution.
- Chert - n. - An impure, massive, flintlike quartz or hornstone, of a dull color.
- Sagenitic - a. - Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.
- Cat's-eye - n. - A variety of quartz or chalcedony, exhibiting opalescent reflections from within, like the eye of a cat. The name is given to other gems affording like effects, esp. the chrysoberyl.