sedimentary

Red Jasper (nodule)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to greasy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to greasy

Identified March 20, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to greasy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9.

Formation & geological history

Formed when fine volcanic ash or silica-rich sediments are consolidated and undergo silicification. The red color is derived from iron impurities that oxidize during the formation process through hydrothermal or sedimentary deposition.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), interior decoration, and as a healing stone in metaphysical practices. Historically used for making tools due to its conchoidal fracture.

Geological facts

Jasper has been used throughout human history, ranging from ancient Egyptian amulets to Minoan seals. It is the primary components of many 'banded iron formations' which are some of the oldest rock units on Earth.

Field identification & locations

Identify in the field by its opacity (unlike translucent carnelian), its red streak on a porcelain plate, and its inability to be scratched by a steel knife. Frequently found in riverbeds, deserts, and coastal regions globally.