sedimentary

Jasper Pebble (Quartzite / Chert)

Microcrystalline Quartz (SiO2 with iron oxide inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on Mohs scale; Color: Reddish-brown, tan, and mottled cream; Luster: Waxy to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58 - 2.91

Hardness: 6
Color: Reddish-brown, tan, and mottled cream
Luster: Waxy to dull

Identified November 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids within sedimentary or volcanic host rocks, frequently colored by iron oxides. This rounded specimen was further shaped and smoothed by fluvial or coastal water erosion.

Uses & applications

Commonly collected as decorative garden stones, tumbled for lapidary work, cabochons, and beginner jewelry crafting.

Geological facts

Jasper has been used by ancient humans for thousands of years both for carving amulets and ornaments, as well as for knapping into sharp stone tools due to its conchoidal fracture.

Field identification & locations

Identify in the field by its hardness (scratches glass easily, cannot be scratched by a steel nail), smooth water-worn surface, and reddish-tan jasperoid hue. Frequently discovered along river gravels, creek beds, and beaches worldwide.