mineral

Yellow Quartz (Iron-stained Quartz)

Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities

Hardness: 7 (Mohs scale), Color: Amber to yellowish-brown, Luster: Vitreous to waxy (especially when water-worn), Crystal System: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified February 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as a secondary mineral in sedimentary environments. These rounded specimens are typically found as water-worn pebbles in riverbeds or coastal regions, having been tumbled by natural erosion over thousands of years.

Uses & applications

Used primarily for lapidary work (tumbling and polishing), as a semi-precious gemstone in jewelry, or for decorative landscaping. In industry, high-purity quartz is used in electronics and glass manufacturing.

Geological facts

The yellow and orange tinting is caused by iron oxides (limonite or hematite) staining the surface or penetrating micro-fractures in the quartz. If it were a deep transparent yellow throughout, it would be classified as natural Citrine.

Field identification & locations

Identify by its hardness (will scratch glass) and lack of cleavage. Common in riverbeds and gravel pits worldwide. Collectors should look for translucency and the characteristic waxy feel of a river-tumbled stone.

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