sedimentary (microcrystalline quartz)

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

AI-generated identification · may be incorrect

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).