Amethyst
Image: <a href="//commons.wikimedia.org/wiki/User:Hgrobe" title="User:Hgrobe">Hannes Grobe</a> (CC BY-SA 4.0)
Mineral NameAmethyst
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorspurple, violet
Transparencytransparent
Type LocalityBrazil
Mineral GroupSilicates
Usesjewelry, ornamental, collector
Associated Mineralscalcite, zeolites, goethite
Raritycommon
Description
Amethyst is a purple variety of quartz, often found as crystals lining geodes or cavities, displaying a range of violet hues.
Geological Context
It forms in hydrothermal veins and cavities within igneous rocks, particularly basaltic lavas, where silica-rich fluids deposit quartz crystals over time.
