mineral

Jasper

Jasper (Silica/Quartz) - SiO2

Hardness: 6.5 - 7 on Mohs scale; Color: typically yellow, red, brown, or green; Luster: Vitreous to dull; Crystal structure: Hexagonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58 - 2.91

Hardness: 6
Color: typically yellow, red, brown, or green
Luster: Vitreous to dull

Identified March 19, 2026More mineral →

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Physical properties

Formation & geological history

Usually formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks. It is an opaque variety of chalcedony. Many specimens date from the Mesozoic or Cenozoic eras.

Uses & applications

Predominantly used for ornamental jewelry (cabochons, beads), decorative objects, and as a popular specimen for collectors and lapidary hobbyists.

Geological facts

The name Jasper means 'spotted or speckled stone.' It was highly prized in the ancient world for its supposed medicinal and spiritual protective properties. Some specific varieties like 'Polychrome Jasper' or 'Yellow Jasper' are named for their unique color patterns.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and its hardness—it cannot be scratched by a steel knife. Common locations include Oregon and Idaho, USA, as well as Madagascar and Brazil.