mineral

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 (Mohs scale), Color: Amber/honey-orange tip with a white milky base, Luster: Vitreous, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified April 21, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Amber/honey-orange tip with a white milky base, Luster: Vitreous, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed as amethyst in volcanic geodes. This specific specimen has been artificially heat-treated (heated to approx. 900°F) to change its color from purple to orange, mimicking natural citrine. Common in Brazil and Uruguay.

Uses & applications

Primarily used for ornamental purposes, metaphysical collecting, and jewelry. It is a popular 'budget' alternative to rare natural citrine.

Geological facts

Most 'citrine' crystals sold in shops are actually burnt amethyst. Natural citrine is usually a pale, uniform lemony-yellow, whereas heat-treated specimens have a concentrated burnt-orange tip and a stark white 'snow' base.

Field identification & locations

Identify by looking for a white, opaque base and 'burnt' orange tips. In the field, look for volcanic basalt containing geodes. It can scratch glass easily.

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