metamorphic
Iron-rich quartzite or weathered ironstone pebble
Quartzite, chiefly SiO₂, with iron-oxide minerals (hematite/goethite)
AI-generated identification · may be incorrectSmall rounded pebble with gray-beige quartz-rich material and rusty brown metallic-looking patches. Likely hardness about 6.5–7, vitreous to dull luster, no obvious cleavage, and relatively high density from iron oxides; the apparent metallic areas may be weathered sulfide or ironstone rather than native metal.
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Physical properties
Small rounded pebble with gray-beige quartz-rich material and rusty brown metallic-looking patches. Likely hardness about 6.5–7, vitreous to dull luster, no obvious cleavage, and relatively high density from iron oxides; the apparent metallic areas may be weathered sulfide or ironstone rather than native metal.
Formation & geological history
Probably formed when quartz-rich sediment was metamorphosed and later stained or cemented by iron oxides during weathering. Exact geological age cannot be determined from the photograph; such rocks are common in ancient continental terrains and sedimentary basins.
Uses & applications
As a small specimen it has mainly educational or collector interest; quartzite is used as aggregate, building stone, and decorative stone. Iron-rich pieces may be tumbled, though this specimen is not visibly gem-grade.
Geological facts
The rounded shape indicates transport by water or erosion. A streak, hardness, and magnetism test would help distinguish ironstone, quartzite, and a metallic-bearing pebble.
Field identification & locations
The Yemen location is compatible with abundant weathered volcanic, metamorphic, and iron-bearing detritus, but the image is insufficient for a precise species identification. Test whether it scratches glass, leaves a red-brown streak, or attracts a magnet; a fresh broken surface and acid test would also help.
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