quartz

1. Colorless glass made of almost pure silica (synset 114903901)
   is a type of: natural glass - magma of any composition that cooled very rapidly
   substance holonym: silica, silicon dioxide, silicon oxide - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
   same as: crystal, lechatelierite, quartz glass, vitreous silica
2. 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 (synset 114717894)
   is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
   subtypes:

   • quartz crystal - a thin plate or small rod of quartz cut along certain lines and ground so that it can produce an electric signal at a constant frequency; used in crystal oscillators
   • rock crystal, transparent quartz - a clear quartz used in making electronic and optical equipment
   • cairngorm, smoky quartz - a smoky yellow or brown quartz
   • amethyst - a transparent purple variety of quartz; used as a gemstone
   • calcedony, chalcedony - a milky or greyish translucent to transparent quartz
   • citrine - semiprecious yellow quartz resembling topaz
   • rose quartz - a translucent rose-red variety of quartz used for ornaments
   • aventurine, sunstone - a translucent quartz spangled with bits of mica or other minerals
   • common topaz, false topaz, topaz - a yellow quartz
   substance holonym:

   • atomic number 14, si, silicon - a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
   • silica, silicon dioxide, silicon oxide - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite

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