Quartz
Image: <a href="//commons.wikimedia.org/wiki/User:Guy_Courtois" class="mw-redirect" title="User:Guy Courtois">Guy Courtois</a> (CC BY-SA 3.0)
Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorswhite, colorless
Transparencytranslucent
Type LocalityWorldwide
Mineral GroupSilicates
Usesjewelry, industrial, collector, electronic components
Associated Mineralsfeldspar, mica, calcite, pyrite
Raritycommon
Description
A large, roughly hemispherical cluster of white to colorless, translucent quartz crystals with distinct hexagonal prisms and pyramidal terminations, displayed on a dark wooden stand.
Geological Context
Quartz commonly forms in hydrothermal veins and pegmatites, crystallizing from silica-rich fluids in cavities and geodes within igneous and metamorphic rocks, and is a primary component of many sedimentary rocks.
