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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