Quartz
Image: <a href="//commons.wikimedia.org/wiki/User:SKas" title="User:SKas">SKas</a> (CC BY-SA 4.0)
Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorsclear, white, yellowish-brown
Transparencytransparent
Type LocalityWorldwide
Mineral GroupSilicates
Usesjewelry, industrial, collector
Associated Mineralsfeldspar, mica, calcite, pyrite
Raritycommon
Description
This specimen features a cluster of clear to yellowish-brown quartz crystals, some with visible terminations, growing on a matrix composed of smaller, granular quartz crystals and other rock material.
Geological Context
Quartz is a common rock-forming mineral found in a wide range of igneous, metamorphic, and sedimentary rocks, often crystallizing from hydrothermal solutions in veins and pegmatites.
