Quartz
Image: <a href="//commons.wikimedia.org/wiki/User:Tuxyso" title="User:Tuxyso">Tuxyso</a> (CC BY-SA 4.0)
Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorscolorless, white, light brown, smoky
Transparencytransparent
Type LocalityJessieville, Arkansas
Mineral Groupsilicates
Usesjewelry, industrial, collector, electronic components
Associated Mineralsfeldspar, mica, calcite, pyrite
Raritycommon
Description
A large cluster of well-formed, terminated quartz crystals, ranging from clear and colorless to light smoky brown, growing from a white to light brown matrix. The specimen exhibits excellent crystal habit and clarity.
Geological Context
Quartz is a common rock-forming mineral found in a wide range of igneous, metamorphic, and sedimentary rocks. It often forms from hydrothermal solutions in veins and pegmatites, or crystallizes from magma.
