sedimentary

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red with dark streaks; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red with dark streaks
Luster: Vitreous to dull

Identified May 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from volcanic ash or water in sedimentary environments. Hematite impurities provide the red color. Found in environments spanning from Precambrian age to recent eras, often appearing in band formations or as nodules.

Uses & applications

Used primarily for lapidary work, jewelry (beads, cabochons), ornamental vases, and as a popular stone for carving and metaphysical collecting. Historically used for seal stones and tools.

Geological facts

Jasper has been a favorite gemstone since the ancient world, referenced in the Bible and utilized by Ancient Egyptians for amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identify by its rich red color, extreme hardness (not easily scratched by steel), and lack of transparency. It is common in riverbeds and desert environments globally, including India, Brazil, and the USA.

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