mineral

Likely rough citrine (yellow quartz)

Quartz, SiO₂; citrine is yellow to orange iron-bearing quartz

AI-generated identification · may be incorrect

The small translucent yellow specimen appears rough and irregular, but the photo does not show enough detail for reliable identification. Quartz has Mohs hardness 7, a glassy luster, hexagonal crystal structure, and no cleavage; yellow color alone is not diagnostic.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Natural citrine forms when trace iron colors quartz, often in hydrothermal veins or pegmatites; much commercial citrine is heat-treated amethyst. The specimen’s origin and age cannot be determined from the image.

Uses & applications

Quartz is used in jewelry, glassmaking, and electronics; attractive citrine is cut or collected.

Geological facts

Yellow calcite, glass, and other minerals can resemble citrine, so testing is needed to confirm the identification.

Field identification & locations

Check for glassy luster, hardness sufficient to scratch ordinary glass, and absence of cleavage; avoid destructive tests on a collectible. Citrine occurs in Brazil, Madagascar, and other quartz-producing regions.