sedimentary

Reddish quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper/chert

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, earthy to weakly glassy luster, opaque, and lacking visible cleavage. The granular/fractured texture and strong red coloration suggest hematite or goethite impurities; exact identification is limited by the photograph.

Identified August 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed when silica-rich sediment or chemically precipitated silica lithified and recrystallized, later acquiring iron staining; commonly Precambrian to younger, depending on locality.

Uses & applications

Used as decorative stone, lapidary material, beads, and occasionally aggregate; attractive pieces may be polished, but these appear as small rough fragments.

Geological facts

Jasper and chert are often difficult to distinguish visually; a steel file should not easily scratch them, while quartz will scratch ordinary glass.

Field identification & locations

Common in iron-rich sedimentary formations, volcanic terrains, and gravel deposits worldwide. Look for waxy/glassy fracture, no cleavage, high hardness, and red coloration that persists through the interior.