sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 Mohs; Color: Opaque brick red; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal) microcrystalline silica; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Opaque brick red
Luster: Vitreous to waxy (when polished)

Identified July 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica in hydrothermal veins or sedimentary environments, often involving volcanic ash. The red color comes from high iron/hematite content during the petrification process.

Uses & applications

Commonly used for tumbled stones, decorative ornaments, jewelry (cabs and beads), and metaphysical healing practices.

Geological facts

Red Jasper has been used for centuries; it was known as a stone of protection for warriors in ancient times. One piece in the image appears to be a banded variety, bridging the classification between Jasper and Agate.

Field identification & locations

Identify by its deep, opaque red color and high hardness (it will scratch glass). It is often found in riverbeds or coastal areas where volcanic and sedimentary rocks interact. Common locations include Brazil, India, and the USA.

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Cone-in-cone structure (Secondary Sedimentary Structure)

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Brecciated Chert (Microcrystalline Silica)

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Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

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Sandstone

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