mineral

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Multi-colored with earthy reds, browns, and translucent tan/white bands; Luster: Vitreous to waxy; Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9

Hardness: 6
Luster: Vitreous to waxy

Identified March 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich hydrothermal fluids in volcanic rock cavities or sedimentary fissures. The 'brecciated' appearance suggests the original jasper was fractured by tectonic force and then re-cemented by later-stage agate/chalcedony flows during the Cenozoic era.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons and pendants), ornamental carvings, and as a metaphysical healing stone. Historically used for making tools due to its conchoidal fracture.

Geological facts

Jasper is technically an impure variety of silica, containing up to 20% foreign material (usually iron oxides) which provides the opaque red and yellow colors. Brecciated Jasper is often called the 'Stone of Strength' or 'Stone of Integration' in folklore.

Field identification & locations

Identify in the field by its hardness (will scratch glass), opaque and translucent banding, and smooth, wax-like feel when tumbled or wet. Commonly found in Western USA (Oregon, Idaho), Brazil, Madagascar, and India. Look for multi-colored nodules in desert washes or volcanic outcrops.

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