mineral

Polished brown jasper pebble

Jasper, an opaque, microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7; opaque reddish- to dark-brown with a waxy to vitreous polish and no visible cleavage. The pale blue-gray patches may be attached matrix or surface coating, so the photo alone cannot establish the exact material.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms as silica-rich fluids fill or replace rock, often incorporating iron oxides that create its color; deposits occur in many ages and settings. The pebble has been shaped and polished, likely by tumbling.

Uses & applications

Used for beads, cabochons, ornaments, and decorative objects; its hardness makes it suitable for polished jewelry.

Geological facts

Jasper is defined chiefly by being opaque, unlike most translucent chalcedony; its colors and patterns vary widely.

Field identification & locations

Check for opacity, hardness, and a fine-grained texture; common sources include Brazil, India, Madagascar, and the western United States. Surface appearance cannot confirm that this specimen is jasper rather than another polished stone.