metamorphic

Tumbled banded quartzite or jasper

Silica-rich quartzite; likely iron-oxide-stained quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; rounded and polished, tan to cream with reddish-brown iron-oxide bands, dull to subtly vitreous luster, and no obvious cleavage. The visible layering may reflect sedimentary banding preserved during silicification or metamorphism.

Identified September 21, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed from quartz-rich sandstone or silica-rich sediment later cemented and/or metamorphosed, with iron oxides producing the brown-red bands. Precise geological age and locality cannot be determined from the photograph.

Uses & applications

Used mainly as a decorative tumbled stone, lapidary material, or paperweight; it has modest collector value and is not typically used as an architectural stone in this form.

Geological facts

Quartzite is highly resistant to weathering, while hematite or limonite commonly creates rusty coloration. The specimen could also be a banded jasper, which cannot be distinguished confidently without testing its texture and translucency.

Field identification & locations

Commonly found in quartzite-bearing metamorphic terrains and gravel deposits. A glass-scratch test, strong light examination, and close inspection for granular quartz texture can help distinguish quartzite from jasper or banded chert.