Image: <a href="//commons.wikimedia.org/wiki/User:Cccefalon" title="User:Cccefalon">CEphoto, Uwe Aranas</a> (CC BY-SA 4.0)
trigonalcommonSilicates
Quartz
SiO2
A geode showcasing an encrustation of clear to white quartz crystals, which appear to be growing on a base of limonite.
Quartz Physical Properties
Mohs Hardness
7Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
noneFracture
conchoidalSpecific Gravity
2.65Colors
colorless, white, brownTransparency
transparentType Locality
Not specifiedMineral Group
SilicatesUses
jewelry, industrial, collectorAssociated Minerals
limoniteRarity
commonGeological Context
Quartz is a ubiquitous mineral found in igneous, metamorphic, and sedimentary rocks. Geodes like this form when mineral-rich fluids deposit quartz crystals within pre-existing cavities in host rocks, often volcanic or sedimentary.
