This large chunk of Citrine Druzy, 2-4 inches in diameter, is great for any mineral collection.
Citrine is a variety of quartz whose color ranges from a pale yellow to brown due to ferric impurities. Quartz itself is the second most abundant mineral in the Earth’s continental crust, after feldspar. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and the Middle East.
Quartz is a defining constituent of granite and other felsic igneous rocks, and can thus be found all over the world. It is very common in sedimentary rocks such as sandstone and shale and is also present in variable amounts as an accessory mineral in most carbonate rocks.Not all varieties of quartz are naturally occurring. Some clear quartz crystals can be treated using heat or gamma-irradiation to induce color where it would not otherwise have occurred naturally. Susceptibility to such treatments depends on the location from which the quartz was mined. However, there are naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, which are expensive and rare.
FOUND IN: BRAZIL, PRIMARILY
Quartz crystals have piezoelectric properties; they develop an electric potential upon the application of mechanical stress. An early use of this property of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. The quartz clock is a familiar device using the mineral.
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