metamorphic
Weathered jasper or iron-stained quartzite
Silicified quartz-rich rock, primarily microcrystalline quartz (SiO₂) with iron-oxide/hydroxide staining
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; mottled orange, red, tan, gray, and cream; waxy to dull luster; dense, fine-grained, with irregular fracture and no obvious cleavage. The rusty colors come from hematite/goethite.
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Physical properties
Hardness about 6.5–7 Mohs; mottled orange, red, tan, gray, and cream; waxy to dull luster; dense, fine-grained, with irregular fracture and no obvious cleavage. The rusty colors come from hematite/goethite.
Formation & geological history
Likely formed by silica-rich fluid replacement or metamorphism of sedimentary material, followed by oxidation and weathering; exact age and locality cannot be determined from the photograph.
Uses & applications
Used as lapidary rough, cabochons, carvings, tumbled stone, and decorative aggregate; attractive pieces may be collectible, but it has little industrial value.
Geological facts
Jasper is an opaque variety of chalcedony or microcrystalline quartz, while quartzite is recrystallized sandstone; both can show similar iron-rich brecciation and color patterns.
Field identification & locations
A glassy scratch test, lack of visible grains, and strong resistance to a steel file support jasper; visible fused quartz grains and sugary texture favor quartzite. Common in oxidized zones, river gravels, and silica-rich volcanic or sedimentary terrains.
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