Synonyms: quartz
Definition: 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
Similar words: mineral
Definition: solid homogeneous inorganic substances occurring in nature having a definite chemical composition
Synonyms: vitreous silica, quartz, quartz glass, crystal, lechatelierite
Definition: colorless glass made of almost pure silica
Similar words: natural glass
Definition: magma of any composition that cooled very rapidly