mineral

Tumbled Amethyst

Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 on Mohs scale; Color: Purple to violet with minor inclusion spots; Luster: Vitreous (glass-like); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Purple to violet with minor inclusion spots
Luster: Vitreous (glass-like)

Identified July 27, 2026More mineral →

Explore Tumbled Amethyst in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed in hydrothermal veins and cavities within volcanic rocks where silica-rich fluids cooled and crystallized over thousands to millions of years, exposed to natural irradiation.

Uses & applications

Used extensively in jewelry, lapidary arts, decorative tumble-stone collections, and metaphysical or crystal healing practices.

Geological facts

Amethyst gets its iconic purple color from irradiation of iron impurities within the quartz crystal lattice. It was historically considered one of the cardinal gems alongside diamond, ruby, sapphire, and emerald until large deposits were found in Brazil.

Field identification & locations

Identified by its distinctive purple color, hardness (scratches glass), and glossy polished surface when tumbled. Commonly found in Brazil, Uruguay, Madagascar, Zambia, and parts of North America.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

sedimentary

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

mineral

Schist

Metamorphic

Septarian Pebble

Septarian nodule / Concretion

sedimentary

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral