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impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles agate
transparent purple variety of quartz; used as a gemstone amethyst
light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars aplite
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 atomic number 14 , Si , silicon
translucent quartz spangled with bits of mica or other minerals aventurine , sunstone
smoky yellow or brown quartz cairngorm , smoky quartz
milky or greyish translucent to transparent quartz calcedony , chalcedony
variety of silica containing microcrystalline quartz chert
semiprecious yellow quartz resembling topaz citrine
yellow quartz common topaz , false topaz , topaz
quartz stone crystal
glassware made of quartz crystal
oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal crystal oscillator , quartz oscillator
grey volcanic rock containing plagioclase and quartz and other crystalline minerals dacite
plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz granite
granitic rock composed of quartz and mica greisen
mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks iron manganese tungsten , wolframite
opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone jasper
mineral form of vitreous or glassy silica; formed by the melting of quartz sand (as by lightning or a meteorite) lechartelierite
optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image optical prism , prism
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