metamorphic

Tumbled quartz-rich stone, possibly quartzite

Quartzite (mostly SiO₂), possibly pale jasper or chalcedony

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; pale cream-gray with a diffuse reddish band, fine-grained texture, and dull to slightly waxy luster. The rounded shape indicates tumbling; individual crystals and cleavage are not visible.

Identified September 15, 2026More metamorphic →

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Physical properties

Formation & geological history

If quartzite, it formed when quartz-rich sandstone recrystallized under metamorphic heat and pressure, commonly during Precambrian–Paleozoic mountain building. The red coloration likely comes from iron oxides; exact identification requires hardness, streak, and translucency tests.

Uses & applications

Used as decorative stone, landscaping aggregate, and occasionally for cabochons or small ornaments. Common tumbled specimens generally have modest commercial value.

Geological facts

Quartzite is composed predominantly of interlocking quartz grains and is typically more resistant than its parent sandstone. The image alone cannot reliably distinguish quartzite from jasper, chalcedony, or another silica-rich tumbled stone.

Field identification & locations

Common sources include Brazil, India, Madagascar, South Africa, and many metamorphic terrains worldwide. A steel file should not scratch it; quartz-rich material may scratch glass, while a white streak and lack of fizz in dilute acid support a silica identification.