A quartz analog speedometer uses the quartz crystal to provide a precise time base for calculating speed by measuring the time taken for the speedometer cable to rotate a certain number of times. The crystal ensures accuracy and stability in measuring speed.
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Quartz is everywhere. Every white grain of sand is quartz.
The subgroup for quartz is silicates.
Amethyst is a violet form of quartz.
Marble is primarily composed of calcite and dolomite, not quartz. However, quartz can sometimes be present in small amounts in marble as impurities or inclusions. Smoky quartz, rose quartz, or clear quartz may be found in marble as well.