mineral

Raw quartz-rich rock fragment

Quartz (SiO₂), likely iron-stained quartz or quartz-bearing feldspathic material

AI-generated identification · may be incorrect

Pale translucent to white with a vitreous luster and irregular fracture; quartz hardness is 7 Mohs, with no cleavage. The orange-yellow coloration likely comes from iron-oxide staining, while the granular texture may indicate feldspar or other matrix minerals.

Identified September 19, 2026More mineral →

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Physical properties

Formation & geological history

Most likely formed in a hydrothermal vein or felsic igneous rock, where silica crystallized from cooling, mineral-rich fluids or magma; its precise geological age cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces may be collected but this fragment is not gem quality.

Geological facts

Quartz commonly shows glassy surfaces and does not scratch easily with a steel knife. Iron staining can produce yellow, orange, or reddish patches without changing the quartz composition.

Field identification & locations

Look for glassy luster, conchoidal fracture, lack of cleavage, and resistance to scratching; common worldwide in veins, granites, sandstones, and metamorphic rocks. A close inspection or hardness test could distinguish quartz from calcite or feldspar.