sedimentary

Red Jasper (with Quartz/Calcite Veins)

Microcrystalline Quartz (SiO2) with Hematite impurities

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on the Mohs scale; Color: Deep brick red to brownish-red with white and gray brecciated veins; Luster: Vitreous to waxy when polished; Crystal system: Trigonal (microcrystalline); Specific gravity: ~2.58 - 2.65; Fracture: Conchoidal.

Hardness: 6
Luster: Vitreous to waxy when polished

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich sediments or volcanic ash interacting with iron oxide (hematite), followed by diagenetic silicification and hydrothermal veining (brecciation) where quartz or calcite filled fractures.

Uses & applications

Commonly shaped and polished into decorative objects, lapidary carvings (such as eggs and spheres), cabochons for jewelry, and collected by mineral enthusiasts.

Geological facts

Red jasper has been used as a gemstone and carving medium since antiquity, favored by ancient Egyptians and Minoans for seals, amulets, and ceremonial carvings. The red color is caused by trace iron inclusions dispersed throughout the silica.

Field identification & locations

Identifiable by its dense opaque red coloration, inability to be scratched by a steel nail, conchoidal fracture where chipped, and prominent white healed fractures. Widespread worldwide, notable deposits are found in India, Madagascar, Russia, Australia, and the USA.