Agate
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Mineral NameAgate
Chemical FormulaSiO2
Mohs Hardness6.5
Crystal Systemtrigonal
Lustervitreous
Streak ColorWhite
CleavageNone
FractureConchoidal
Specific Gravity2.6
Colorsyellow, orange, black, white, clear
TransparencyTranslucent
Type LocalityWorldwide
Mineral GroupSilicates
Usesjewelry, ornamental objects, collector
Associated Mineralsquartz, calcite, zeolites
Raritycommon
Description
A visually striking specimen of banded agate, displaying intricate layers of yellow, orange, and black chalcedony, with internal vugs lined by sparkling white crystalline quartz.
Geological Context
Agate typically forms in cavities within volcanic rocks, such as basalt, where silica-rich fluids deposit successive layers of cryptocrystalline quartz (chalcedony) over time, often incorporating impurities that create its characteristic banding.
