"Quartzite" is a word in ENGLISH

A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of …

A yellow or smoky brown variety of rock crystal, or crystallized quartz, found esp, in the mountain of Cairngorm, in …

The material of quartz, in crystallization transparent or nearly so, and either colorless or slightly tinged with gray, or the …

A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz.

A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in …

A crystalline, granular rock, consisting of quartz, feldspar, and mica, and usually of a whitish, grayish, or flesh-red color. It …

A whitish, granular rock, consisting of feldspar and quartz intimately mixed; -- sometimes called whitestone, and leptynite.

In mining law. A superficial deposit of sand, gravel, or disintegrated rock, carrylng one or more of the preclous metals, …

A term used somewhat loosely to designate a rock consisting of a fine-grained base (usually feldspathic) through which crystals, as …

A large vein of auriferous quartz; -- so called in Australia. Hence, any body of rock yielding valuable ore.

A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Any crystalline rock having a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The …

Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite.

Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

The nonmetalliferous mineral or rock material which accompanies the ores in a vein, as quartz, calcite, barite, fluor spar, etc.; …