mineral

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Hardness: 7 (Mohs scale); Color: Purple, lavender, white, and translucent gray; Luster: Vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.63 - 2.65

Hardness: 7 (Mohs scale)
Color: Purple, lavender, white, and translucent gray
Luster: Vitreous

Identified March 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids deposit in volcanic rock cavities (geodes or veins) during cooling. The purple banding is caused by iron impurities irradiated by natural background radiation over millions of years.

Uses & applications

Primarily used in jewelry (cabochons and beads), ornamental home decor, and spiritual/metaphysical collections.

Geological facts

Banded amethyst, often called 'Chevron Amethyst', unique because it combines the macrocrystalline structure of amethyst with the microcrystalline structure of white quartz or chalcedony. It is one of the most popular varieties for lapidary work.

Field identification & locations

Identify by its characteristic V-shaped or wavy white and purple bands and its ability to scratch glass. Commonly found in Brazil, Uruguay, and Africa (specifically Zambia). To collect, look for colorful veins in basaltic rock outcroppings.

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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