mineral

Citrine (natural quartz crystal)

Quartz, SiO₂; the yellow-brown color may be natural citrine or heat-treated amethyst

AI-generated identification · may be incorrect

Mohs hardness 7; transparent to translucent, glassy luster, typically hexagonal crystal structure, and no cleavage. The specimen is an elongated, pale honey-brown crystal, but color alone cannot establish whether it is natural or treated.

Identified October 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz grows from silica-rich fluids in cavities and veins; natural citrine coloration is caused by trace iron and geologic heating. Quartz occurs in rocks of many ages, while much commercial citrine is heat-treated amethyst.

Uses & applications

Used as a gemstone and collectible crystal; quartz also has extensive industrial use in electronics and glassmaking.

Geological facts

Citrine is the yellow-to-brown variety of quartz; naturally occurring, strongly colored citrine is less common than heat-treated material.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch glass, and quartz-like crystal form; common sources include Brazil, Madagascar, and Uruguay. Treatment and provenance require testing or reliable seller information.