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In page Crystal oscillator:
"Crystals for AT-cut are the most common in mass production of oscillator materials; the shape and dimensions are optimized for high yield of the required wafers. High-purity quartz crystals are grown with especially low content of aluminium, alkali metal and other impurities and minimal defects; the low amount of alkali metals provides increased resistance to ionizing radiation.[citation needed] Crystals for wrist watches, for cutting the tuning fork 32768 Hz crystals, are grown with very low etch channel density.
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