mineral

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

AI-generated identification · may be incorrect

Tan, cream, and gray mottling with a dull to slightly glassy luster; visibly granular and irregular, without clear cleavage. Quartz has Mohs hardness 7, while feldspar is about 6; specific gravity likely 2.6–2.7.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Probably a naturally weathered fragment of quartzite, granite, or feldspar-rich vein rock formed in an igneous or metamorphic setting. Its geological age cannot be determined from the photograph.

Uses & applications

Primarily a collecting specimen; comparable quartz-rich material may be used as aggregate or decorative stone, but this small fragment has no practical industrial value.

Geological facts

The pale translucent grains and angular fracture are consistent with quartz, while tan opaque areas may be feldspar, iron-oxide staining, or weathering products.

Field identification & locations

Commonly found in weathered outcrops, stream gravels, and gravel deposits worldwide. Confirm by scratch testing: quartz should scratch glass, while a steel nail generally will not; dilute hydrochloric acid testing can help detect calcite if fizzing occurs.