sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish red; Luster: Vitreous to dull; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Deep brick red to brownish red
Luster: Vitreous to dull

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water solutions into cavities of volcanic rocks or within sedimentary formations. Its red color comes from iron impurities (hematite) during the lithification process over millions of years.

Uses & applications

Used primarily in lapidary arts for jewelry, decorative carvings, and polished pocket stones. Historically used for ornaments and seals.

Geological facts

Jasper has been a favorite gemstone since antiquity; it is mentioned in the Bible and was highly prized by the ancient Egyptians and Babylonians for its protective qualities.

Field identification & locations

Identify by its opaque nature (unlike carnelian which is translucent) and dull waxy luster before polishing. Commonly found in riverbeds or gravel deposits in India, Russia, Brazil, and the USA (southwestern states).

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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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