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)
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Physical properties
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
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).
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