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Composition
Quartz stones are composed of silicone dioxide. Silicon dioxide in the form of quartz is one of the most abundant minerals on the planet and found throughout the earth's crust.
Location
Drusy can form on just about any mineral substrate, but the gem-quality drusy quartz generally forms inside geodes--hollow rocks with crystalline structures inside. Brazil and Indonesia are major sources of drusy quartz, according to David Federman.
Uses
Drusy quartz is used as a gemstone in jewelry and Gemtradenet.com reports that is most suitable for pendants, earrings and brooches. Quartz crystals are also used in clocks and for computer equipment.
Alterations
Drusy quartz may be dyed or given a titanium coating in an attempt to improve the aesthetic quality of the gemstones, according to Gemtradenet.com.
Cost
Drusy quartz prices have a significant range. In 2007, drusy quartz prices could range from $15 up to $200 or more, depending on the quality, according to David Federman.