Agate
Image: Ronveron (CC BY-SA 3.0)
Mineral NameAgate
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorsred, orange, white, pale blue
Transparencytranslucent
Type LocalityWorldwide
Mineral GroupSilicates
Usesjewelry, ornamental objects, industrial, collector
Associated Mineralsquartz, calcite, zeolites
Raritycommon
Description
This agate slab displays vibrant red and orange hues, intricately patterned with swirling bands of white and pale blue chalcedony. The texture appears somewhat porous and organic in the red areas, contrasting with the smooth, waxy appearance of the lighter bands.
Geological Context
Agate forms in cavities of volcanic rocks (like basalt) or ancient lavas, where silica-rich fluids deposit successive layers of chalcedony. It can also be found in some metamorphic and sedimentary rocks.
