Red Jasper

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Brick red, orange, and yellow; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.58-2.91

Formation & Geological History

Commonly formed when silica-rich fluids permeate volcanic ash or sedimentary rocks, often during the Proterozoic or Paleozoic eras as part of banded iron formations.

Uses & Applications

Used primarily for lapidary work, decorative cabochons, jewelry, seal stones, and as an ornamental garden stone.

Geological Facts

Jasper has been used as a gemstone since antiquity and is mentioned in various historical texts such as the Bible. The red color is specifically due to high concentrations of iron oxide (hematite).

Field Identification & Locations

Look for a smooth, opaque, waxy finish on pebbles. Common in riverbeds and coastal areas of India, Brazil, Australia, and the USA. It will not scratch with a pocketknife.

Identified on: 5/14/2026

Mode: Standard