mineral

Ametrine

Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 mohs; Color: Bi-color (purple and yellow/orange); Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.65

Hardness: 7 mohs
Color: Bi-color (purple and yellow/orange)
Luster: Vitreous

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 7 mohs; Color: Bi-color (purple and yellow/orange); Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.65

Formation & geological history

Formed through the combination of amethyst and citrine within the same crystal. This occurs due to a temperature gradient across the crystal during its growth, typically in hydrothermal veins. The color difference is caused by varying oxidation states of iron within the quartz lattice.

Uses & applications

Primarily used in jewelry (faceting, cabochons) and as a collector specimen due to its unique bi-color appearance. It is highly valued in lapidary arts.

Geological facts

Almost all natural ametrine is mined from a single location: the Anahi Mine in Bolivia. Legend says it was first introduced to Europe in the 1600s by a Spanish conquistador who received the mine as a dowry.

Field identification & locations

Identify by looking for distinct zones of purple and yellow within a single transparent stone. Natural stones have a sharp transition, whereas synthetic or treated versions may look blended or overly vibrant. It is typically found in Bolivia.