![]() In addition, synthetic fused silica is used for various purposes, such as to make the envelopes of halogen lamps, the sheaths of electric elements, and the precision mirrors of telescopes. Today, quartz crystals are commonly used to make "oscillators" that keep track of time in wristwatches, provide a stable clock signal for digital integrated circuits, and stabilize radio transmitter frequencies. Historically, different varieties of quartz-such as agate, amethyst, onyx, and tiger's eye-have been used as gemstones. Pure quartz is made of crystallized silica (silicon dioxide, SiO 2), but in nature it occurs in many varieties based on the presence of small amounts of other substances. ![]() Quartz is one of the most common minerals in the Earth's continental crust. White, translucent to opaque, may display diasterism Pink, translucent, may display diasterism Yellow to reddish orange, greenish yellow ![]() Translucent chalcedony with small inclusions (usually mica) that shimmer.Ĭrimson glass-like crystal, absorbs vast amounts of solar energy Otherwise more specific names are used.Īgate where the bands are straight, parallel and consistent in size. ![]() Clear (if no impurities) also see VarietiesĦ-sided prism ending in 6-sided pyramid (typical)Ģ.65 constant variable in impure varietiesĪny cryptocrystalline quartz, although generally only used for white or lightly coloured material. ![]()
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