Amethyst
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Mineral NameAmethyst
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorspurple, violet
Transparencytransparent
Type LocalityMinas Gerais, Brazil
Mineral GroupSilicates
Usesjewelry, ornamental, collector
Associated Mineralsquartz, calcite, feldspar
Raritycommon
Description
Amethyst is a purple variety of quartz, often forming as prismatic crystals or drusy linings within geodes, displaying a range of violet hues.
Geological Context
It forms in hydrothermal veins, pegmatites, and geodes within volcanic rocks, with its characteristic purple color resulting from irradiation of iron impurities within the quartz lattice.
