sedimentary or metamorphic

Red Jasper (possibly with Quartz or Hematite)

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness: 6.5-7 (Mohs), Color: Opaque brick red to maroon, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Fracture: Conchoidal, Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 21, 2026More sedimentary or metamorphic →

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Physical properties

Hardness: 6.5-7 (Mohs), Color: Opaque brick red to maroon, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Fracture: Conchoidal, Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine-grained silica in sedimentary environments or as secondary fluids filling fractures in volcanic rock. The red color is caused by iron (hematite) inclusions within the cryptocrystalline quartz.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), carvings, and as a popular specimen for crystal healing and decorative collections.

Geological facts

Jasper is a variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used in seals and amulets since ancient Mesopotamian and Greek times.

Field identification & locations

Identify by its opacity (unlike translucent carnelian), smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert environments in the western USA, India, Russia, and Brazil.

Other sedimentary or metamorphic specimens

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Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Sedimentary or Metamorphic (low-grade)

Anthracite Coal

Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)

metamorphic

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

mineral

Anthracite Coal

Anthracite (Carbon-based sedimentary-derived metamorphic rock)

metamorphic

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

sedimentary

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

mixed