metamorphic
Red-gray metamorphic pebble, likely jasper-bearing quartzite
Ferruginous quartzite/jasper; predominantly microcrystalline SiO₂ with iron oxides
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; reddish brown and dark gray, opaque, with a dull to slightly waxy luster. Massive, fine-grained texture and irregular fracture; the rounded shape indicates natural water wear.
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Physical properties
Hardness about 6.5–7 Mohs; reddish brown and dark gray, opaque, with a dull to slightly waxy luster. Massive, fine-grained texture and irregular fracture; the rounded shape indicates natural water wear.
Formation & geological history
Likely formed when quartz-rich sediment was metamorphosed and later stained by hematite or altered into jasper-like silica. The specimen’s exact geological age and source cannot be determined from the image alone.
Uses & applications
Used as aggregate, dimension stone, lapidary material, and occasionally for cabochons or polished ornaments; this small pebble has mainly educational or decorative value.
Geological facts
The red color commonly comes from finely dispersed hematite, while the gray portions may be quartz-rich or contain darker iron-bearing minerals. A steel file should barely scratch it, whereas quartz should not.
Field identification & locations
Common in stream gravels and exposed metamorphic terrains worldwide, including quartzite-bearing regions. Confirm with a hardness test, streak test, and ideally acid testing or thin-section/mineral analysis; visual identification is provisional.
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