mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with iron impurities
Hardness: 7 (Mohs scale), Color: light purple to lavender, Luster: vitreous (glassy), Crystal system: Trigonal/Hexagonal, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: light purple to lavender, Luster: vitreous (glassy), Crystal system: Trigonal/Hexagonal, Specific gravity: 2.65
Formation & geological history
Formed in igneous or metamorphic host rocks, often inside geodes or hydrothermal veins where silica-rich fluids cool and crystallize over thousands of years.
Uses & applications
Jewelry, lapidary arts, metaphysical/decorative collecting, and historically used to prevent intoxication (ancient Greek lore).
Geological facts
Amethyst gets its purple color from irradiation, iron impurities, and the presence of trace elements. It is the birthstone for February.
Field identification & locations
Identify by its characteristic purple color and lack of cleavage. Common in Brazil, Uruguay, Namibia, and Arizona. Tumbled specimens feel smooth and look like polished pebbles.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous