Quartz Geode
Image: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/65449832@N00">R'lyeh Imaging</a> (CC BY 2.0)
Mineral NameQuartz Geode
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorscolorless, white, brown
Transparencytransparent/translucent
Type LocalityWorldwide, commonly in volcanic and sedimentary rocks
Mineral GroupSilicates
Usesjewelry, industrial, collector
Associated Mineralschalcedony, calcite, iron oxides
Raritycommon
Description
A macro view of the interior of a geode, showcasing numerous small, pointed quartz crystals ranging from clear to milky white, interspersed with reddish-brown earthy material.
Geological Context
Geodes form when mineral-rich fluids deposit layers of silica within cavities in volcanic or sedimentary rocks, slowly crystallizing into quartz over geological time.
