Quartz
Image: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/14730981@N08">James Petts</a> from London, England (CC BY-SA 2.0)
Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorscolorless, white
Transparencytransparent
Type LocalityWorldwide, e.g., Brazil, Arkansas (USA), Alps
Mineral GroupSilicates
Usesjewelry, industrial, collector, oscillators, abrasives
Associated Mineralsfeldspar, mica, calcite, pyrite, tourmaline
Raritycommon
Description
A clear, colorless quartz crystal fragment, exhibiting a vitreous luster and some internal fractures or inclusions, typical of rock crystal.
Geological Context
Quartz is a common rock-forming mineral found in igneous, metamorphic, and sedimentary rocks, often crystallizing from silica-rich hydrothermal fluids in veins and pegmatites.
