mineral

Yellow Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 7 on Mohs scale. Color: Translucent white to yellow/orange due to iron staining. Luster: Vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Translucent white to yellow/orange due to iron staining
Luster: Vitreous (glassy)

Identified March 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes in veins or as a primary constituent of igneous rocks. The yellow coloration typically comes from secondary iron oxide (limonite or hematite) staining that permeates cracks or coats the surface over geological time.

Uses & applications

Used in glassmaking, as an abrasive, in decorative landscaping, and occasionally as a semi-precious gemstone (citrine is the high-clarity yellow variety). Common specimens are popular for beginner rock tumbling.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this one, found in riverbeds, become naturally rounded and smoothed by water erosion over thousands of years.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. It is commonly found in gravel pits, riverbeds, and mountainous regions worldwide. For collectors, look for the internal 'fractures' or 'veils' that catch the light.

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