sedimentary (microcrystalline quartz)

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

Hardness: 6.5–7 on Mohs scale; Color: Deep red to brownish-red; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Hexagonal/Trigonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58–2.91

Hardness: 6
Color: Deep red to brownish-red
Luster: Dull to vitreous (waxy when polished)

Identified March 28, 2026More sedimentary (microcrystalline quartz) →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or volcanic ash into sedimentary environments, often associated with iron-rich deposits. These can date from the Precambrian to the Cenozoic era.

Uses & applications

Commonly used for lapidary work, cabochons, beads, and architectural ornamentation. Historically used for seals and carvings; in modern times, it is a popular metaphysical stone and collector's rock.

Geological facts

The name comes from the Greek 'iaspis', meaning spotted stone. It was once considered the 'rain-bringer' in ancient indigenous cultures and is mentioned in biblical texts as a stone of the High Priest's breastplate.

Field identification & locations

Identify in the field by its opacity (it does not transmit light even on thin edges), its red streak on a streak plate, and its high hardness which will scratch glass. Commonly found in riverbeds, desert pavements, and near iron mines globally (USA, Brazil, India).

Other sedimentary (microcrystalline quartz) specimens

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K2 Jasper (K2 Granite)

Azurite in Granite (Biotite Granite with Azurite inclusions)

igneous

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

igneous

Dalmatian Jasper

Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)

igneous

Black Jasper (Black Onyx substitute)

Silicon Dioxide (SiO2) with carbonaceous impurities

sedimentary (microcrystalline quartz)

Yellow Jasper

Chalcedony (Silicon Dioxide, SiO2)

sedimentary (microcrystalline quartz)

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary (microcrystalline quartz)