metamorphic
Tumbled yellow-brown quartzite or jasper
Quartzite, predominantly microcrystalline quartz (SiO₂), possibly iron-stained jasper
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque cream, golden-brown, and reddish coloration with vitreous-to-waxy luster. Massive, nonfoliated texture, no obvious cleavage, and high durability; the rounded shape indicates tumbling or natural abrasion.
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Physical properties
Hardness about 6.5–7 Mohs; opaque cream, golden-brown, and reddish coloration with vitreous-to-waxy luster. Massive, nonfoliated texture, no obvious cleavage, and high durability; the rounded shape indicates tumbling or natural abrasion.
Formation & geological history
Likely derived from silica-rich sandstone metamorphosed into quartzite, with iron oxides producing the yellow-brown colors; if jasper, it formed from silicified volcanic or sedimentary material. The specimen’s geological age cannot be determined visually.
Uses & applications
Used as a durable ornamental stone, lapidary material, cabochons, beads, polished stones, and decorative aggregate; generally unsuitable for high-value jewelry unless unusually attractive.
Geological facts
Quartzite commonly resists scratching by steel and can scratch glass. Iron staining and mixed translucency often distinguish it from uniformly colored manufactured glass or resin.
Field identification & locations
Common in metamorphic terrains worldwide, including Brazil, India, Madagascar, and the western United States. Test with a steel file or glass-scratch test, inspect for granular quartz texture, and check that bubbles or flow lines are absent.
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