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n. A very hard mineral composed of silica, SiO2, found worldwide in many different types of rocks, including sandstone and granite. Varieties of quartz include agate, chalcedony, chert, flint, opal, and rock crystal.

n. The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.

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.

n. The common form of native silica, Or the oxid of silicon (SiO2).

n. colorless glass made of almost pure silica

n. a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities

"You find tin wherever you like to cut down to one kind o 'rock as is what they call quartz, and where there's tin in it there's a lot o' red powder as well; and when you break a bit there's the tin, all in pretty little black shiny grains."

natural glass   

milky quartz    quartz thread    capped quartz    quartz drift    vein-quartz    babel quartz    quartz glass    hungry quartz    quartz spectrograph   

silicon    flint    crystal    amethyst    citrine    false topaz    chert    chalcedony    onyx    jasper   

Schwartz    aborts    bortz    contorts    courts    distorts    exhorts    extorts    fortes    forts   

sandstone    mica    flint    basalt    jasper    chalk    slate    shale    crystal    gypsum