Quartz
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Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorsyellowish-brown, clear, white
Transparencytranslucent
Type LocalityBrookdale Mine, Wheatley Mines, Phoenixville, Chester County, Pennsylvania, USA
Mineral GroupSilicates
Usesjewelry, industrial, collector
Associated Mineralsfeldspar, mica, pyrite, galena, sphalerite
Raritycommon
Description
A single, well-formed quartz crystal with a yellowish-brown termination transitioning to clearer, lighter zones towards its base, showing some minor dark inclusions.
Geological Context
Quartz is a ubiquitous mineral found in various geological settings, commonly crystallizing from hydrothermal solutions in veins or pegmatites, or as a primary component of igneous and metamorphic rocks.
