Quartz
- (1): a mineral consisting
of silicon dioxide occurring in colorless and transparent or
colored hexagonal crystals or in crystalline masses. (2) : a
quartz crystal that when placed in an electric field oscillates
at a constant frequency and is used to control devices which
require precise regulation <a quartz watch>
(Source: Merriam-Webster Online Dictionary)
- crystalline mineral:
a usually colorless transparent crystalline mineral widely distributed
in rocks of all types. Colored varieties are used as gemstones.
Its hardness makes it a valuable industrial component, for example,
as a frequency control in electronic communications and timing
devices.
(Source: Encarta® World English Dictionary)
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Ozone Generators, Ozone
Gas Analyzers, and Ozone
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