mineral
Tumbled jasper or chalcedony pebble
Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; cream, honey-brown, white, and gray coloration with earthy iron staining; opaque to slightly translucent, waxy to dull luster, and no visible cleavage. The rounded shape indicates natural abrasion or tumbling.
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Physical properties
Hardness about 6.5–7 Mohs; cream, honey-brown, white, and gray coloration with earthy iron staining; opaque to slightly translucent, waxy to dull luster, and no visible cleavage. The rounded shape indicates natural abrasion or tumbling.
Formation & geological history
Formed when silica-rich fluids filled cavities or replaced volcanic/sedimentary material, with iron oxides producing the brown-yellow colors; commonly Cenozoic or older, depending on source. The exact variety cannot be confirmed from the photograph alone.
Uses & applications
Used as a lapidary stone for tumbled pieces, cabochons, carvings, and inexpensive jewelry; attractive specimens may be collected but are generally common.
Geological facts
Jasper is opaque microcrystalline quartz, whereas chalcedony is commonly translucent; mixed specimens can grade between them. Iron staining often creates the warm orange, tan, and brown patches visible here.
Field identification & locations
Identify by its glassy-to-waxy appearance, lack of cleavage, rounded texture, and ability to scratch glass; a steel file should not scratch it easily. Common in volcanic terrains, river gravels, and silica-rich deposits worldwide.
