Druzy Quartz Geode in Flint
Image: <bdi><a href="//commons.wikimedia.org/wiki/User:ComputerHotline" title="User:ComputerHotline">Thomas Bresson</a></bdi> (CC BY 3.0)
Mineral NameDruzy Quartz Geode in Flint
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Streak ColorWhite
CleavageNone
FractureConchoidal
Specific Gravity2.65
Colorswhite, cream, light brown, tan
TransparencyTranslucent to Opaque
Type LocalityWorldwide
Mineral GroupSilicates
Usescollector, decorative
Associated Mineralschalcedony, calcite
Raritycommon
Description
A geode-like specimen featuring a cavity lined with small, sparkling, off-white to light brown druzy quartz crystals, encased within a lighter, more massive outer layer of flint.
Geological Context
Forms in sedimentary rocks, particularly limestone or chalk, where silica-rich fluids fill voids, precipitating cryptocrystalline and microcrystalline quartz (flint, chalcedony, and druzy quartz) over time.
