sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red to reddish-brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Deep red to reddish-brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to reddish-brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91.
Formation & geological history
Formed when microcrystalline quartz settles out of silica-rich solutions in sedimentary environments or volcanic ash deposits, with its red color derived from high iron content.
Uses & applications
Commonly used as a gemstone for jewelry, carvings, ornaments, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Red Jasper has been used since ancient times for talismans and seals; it was mentioned in the Bible and utilized by Egyptians for amulets. It is often referred to as a stone of endurance and physical strength.
Field identification & locations
Identify in the field by its opaque red color, waxy luster when broken, and extreme hardness (it will scratch glass). Commonly found in stream beds or gravel deposits worldwide, notably in India, Brazil, and the USA.
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