mineral

Yellow quartz, possibly citrine

Quartz (SiO₂), yellow variety likely citrine; may also be iron-stained quartz

AI-generated identification · may be incorrect

Mohs hardness 7; translucent yellow to honey-yellow, vitreous luster, conchoidal fracture, no cleavage, trigonal crystal structure, specific gravity about 2.65. The rounded shape suggests tumbling or abrasion.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Natural citrine forms when trace iron colors quartz during hydrothermal or igneous processes; much commercial citrine is heat-treated amethyst or smoky quartz. Quartz is widespread and commonly Precambrian to recent, depending on its host rock.

Uses & applications

Used as a low-cost gemstone, lapidary material, ornament, and collector specimen; quartz is also important in glass, electronics, and abrasives.

Geological facts

True citrine is relatively uncommon compared with heat-treated amethyst. Strong yellow-orange color, transparency, and crystal form increase desirability.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and absence of cleavage; a scratch test should be avoided on valuable pieces. Common sources include Brazil, Madagascar, Spain, and Uruguay.