| 41. | Some believe that its caused by piezoelectricity from the constant stress that area underground quartz crystals are under.
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| 42. | They used quartz crystals to generate light, likely hundreds of years before the modern world recognized the phenomenon.
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| 43. | It is especially noted for specimens that combine deep black smoky quartz crystals intermixed with deep blue amazonite.
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| 44. | So he took a picture of one of his specimens, a nice quartz crystal from Mount Ida, Ark.
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| 45. | Quartz's quartz crystal oscillators in 1923.
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| 46. | He tried using quartz as a delay medium and reported that anisotropy in the quartz crystals caused problems.
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| 47. | They were the most accurate clocks available prior to the development of the quartz crystal and atomic clocks.
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| 48. | Most people are familiar with digital tuners, which lock onto broadcast waves with the help of a quartz crystal.
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| 49. | He collects double-terminated quartz crystals.
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| 50. | Quartz crystal and seashells are also associated with the Rainbow Serpent and are used in rituals to invoke it.
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