Quartz
Image: <a href="//commons.wikimedia.org/wiki/User:Notafly" title="User:Notafly">Notafly</a> (CC BY-SA 3.0)
Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorscolorless, white, purple, pink, yellow, brown, black
Transparencytransparent
Type LocalityWorldwide
Mineral GroupSilicates
Usesjewelry, industrial, collector, educational
Associated Mineralsfeldspar, mica, calcite, pyrite
Raritycommon
Description
This image displays a vintage school mineralogy and rock collection, featuring numerous small specimens organized in a grid. Many varieties of quartz, such as amethyst and agate, are likely present within this diverse collection, alongside other common minerals and rocks.
Geological Context
Quartz is a ubiquitous mineral found in igneous, metamorphic, and sedimentary rocks, forming from a wide range of geological processes including crystallization from magma, hydrothermal deposition, and weathering of existing rocks.
