metamorphic
Tumbled brown quartzite or jasper
Quartzite (mostly SiO₂), possibly iron-rich jasper (microcrystalline quartz)
AI-generated identification · may be incorrectSmall, smoothly tumbled brown-orange stone with a dull to slightly waxy luster. Quartz hardness is about Mohs 7; quartzite is granular and non-cleaving, while jasper is dense and cryptocrystalline. Exact identification is limited by the dark image.
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Physical properties
Small, smoothly tumbled brown-orange stone with a dull to slightly waxy luster. Quartz hardness is about Mohs 7; quartzite is granular and non-cleaving, while jasper is dense and cryptocrystalline. Exact identification is limited by the dark image.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized during metamorphism; jasper forms from silica-rich chemical or volcanic sediment. These rocks may range from Precambrian to younger ages, depending on source.
Uses & applications
Commonly used as a tumbled stone, pendant material, decorative aggregate, and lapidary specimen; quartzite also has construction uses.
Geological facts
The brown color likely comes from iron oxides such as hematite or goethite. A steel knife should not easily scratch it, whereas quartz will scratch ordinary glass.
Field identification & locations
Likely sources include metamorphic belts and silica-rich volcanic or sedimentary terrains worldwide. Test with a steel file or glass, inspect for granular quartz versus smooth opaque microcrystalline texture, and use a streak test cautiously.
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