sedimentary

Red Jasper (Mookaite style)

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness: 6.5-7 on Mohs scale. Color: Opaque red, maroon, and mustard yellow. Luster: Dull to vitreous/waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.9.

Hardness: 6
Color: Opaque red, maroon, and mustard yellow
Luster: Dull to vitreous/waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of microcrystalline silica (quartz) and iron-rich minerals. Often found as nodules or fillings in cracks and cavities. This specific banded/mottled appearance is common in sedimentary contexts where iron content varies during deposition.

Uses & applications

Commonly used for lapidary work (cabochons, beads), jewelry, decorative carvings, and as a popular specimen for rock collectors and metaphysical use.

Geological facts

Jasper is an impure variety of silica. The red color is typically caused by iron (III) inclusions. It was a favorite gemstone in the ancient world, mentioned in several early lapidaries of the Greeks and Romans.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), conchoidal fracture pattern, and opaque nature. Common in riverbeds or desert regions of Australia, India, and the USA.

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