Image: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/47445767@N05">James St. John</a> (CC BY 2.0)
trigonalcommonSilicates
Quartz
SiO2
Clear to white, prismatic quartz crystals lining a vug (cavity) within a darker, fine-grained sedimentary rock identified as flint or chert.
Quartz Physical Properties
Mohs Hardness
7Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
noneFracture
conchoidalSpecific Gravity
2.65Colors
colorless, white, purple, pink, yellow, brown, blackTransparency
transparentType Locality
Nethers Flint Quarries, Flint Ridge, Ohio, USAMineral Group
SilicatesUses
jewelry, industrial, collector, abrasives, electronicsAssociated Minerals
chert, flint, feldspar, micaRarity
commonGeological Context
Formed in a sedimentary environment, likely through the precipitation of silica-rich fluids into a void within chert (flint) during diagenesis or later hydrothermal activity, originating from the Pennsylvanian period.
