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Quartz is a hard,
crystalline mineral composed of
silica (silicon dioxide). The
atoms are
linked in a
continuous framework of SiO4 silicon–oxygen tetrahedra...
- Look up
quartz in Wiktionary, the free dictionary.
Quartz is a
common mineral.
Quartz may also
refer to:
Quartz, California,
former settlement in Butte...
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Quartz clocks and
quartz watches are
timepieces that use an
electronic oscillator regulated by a
quartz crystal to keep time. This
crystal oscillator...
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comprise about 20–25% of all
sedimentary rocks. Most
sandstone is
composed of
quartz or feldspar,
because they are the most
resistant minerals to the weathering...
- The room-temperature form of
quartz, α-
quartz,
undergoes a
reversible change in
crystal structure at 573 °C to form β-
quartz. This
phenomenon is called...
- element. The
oscillator frequency is
often used to keep
track of time, as in
quartz wris****ches, to
provide a
stable clock signal for
digital integrated circuits...
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Amethyst is a
violet variety of
quartz. The name
comes from the
Koine Gr**** αμέθυστος
amethystos from α- a-, "not" and μεθύσκω (Ancient Gr****) methysko...
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Fused quartz,
fused silica or
quartz gl**** is a gl****
consisting of
almost pure
silica (silicon dioxide, SiO2) in
amorphous (non-crystalline) form. This...
- watches. In the 1960s the
electronic quartz watch was invented,
powered by a
battery and
keeping time with a
vibrating quartz crystal. By the 1980s it took over...
- of
silicon with the
chemical formula SiO2,
commonly found in
nature as
quartz. In many
parts of the world,
silica is the
major constituent of sand. Silica...
