quarzo

Definitions of quarzo
  1. noun
    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
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    types:
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    ametista
    a transparent purple variety of quartz; used as a gemstone
    calcedonio
    a milky or greyish translucent to transparent quartz
    agata
    an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
    eliotropio
    green chalcedony with red spots that resemble blood
    onice
    a chalcedony with alternating black and white bands; used in making cameos
    type of:
    minerale
    solid homogeneous inorganic substances occurring in nature having a definite chemical composition
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