mineral

Amethyst Geode Fragment

Amethyst (Silicon Dioxide, SiO2) with Quartz matrix

Hardness: 7 (Mohs scale); Color: Purple to violet interior with a white/grey quartz crust; Luster: Vitreous (glassy) crystals; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).

Hardness: 7 (Mohs scale)
Color: Purple to violet interior with a white/grey quartz crust
Luster: Vitreous (glassy) crystals

Identified July 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hollow cavities (vugs) within volcanic or sedimentary rocks where mineral-rich hydrothermal fluids deposit crystals over time. This specimen likely originates from basaltic rock cavities.

Uses & applications

Primarily used for decorative display, energy work (metaphysical), and jewelry when individual crystals are extracted. Small fragments are popular for educational purposes and introductory collecting.

Geological facts

The purple color of amethyst comes from irradiation, iron impurities, and the presence of trace elements. This specific piece is a small 'vug' or geode section showcasing the druzy (tiny) crystal formation.

Field identification & locations

Identify in the field by looking for rounded, lumpy nodules with a rough, weathered exterior. Breaking them open reveals the hollow center with inward-pointing crystals. Common in Brazil, Uruguay, and Morocco.

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