mineral

Red Jasper

Silicon Dioxide (SiO2) with iron inclusions

Hardness: 6.5-7 (Mohs), Color: Reddish-brown with yellow banding, Luster: Vitreous to dull, Crystal Structure: Trigonal, Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs), Color: Reddish-brown with yellow banding, Luster: Vitreous to dull, Crystal Structure: Trigonal, Cleavage: None, Specific Gravity: 2.58-2.91

Formation & geological history

Formed from volcanic ash or fine-grained silica sediment that became saturated with iron minerals. Occurs typically in hydrothermal veins or as nodules in sedimentary rocks.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a collector specimen.

Geological facts

Jasper is an aggregate of microcrystalline quartz. The red color is caused by iron (hematite) inclusions. It has been used for seals and jewelry since antiquity.

Field identification & locations

Identify by its smooth, waxy feel when polished, its opaque nature, and its red/brown streak. Common in river beds and desert environments globally.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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Epidote

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Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral