sedimentary
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Deep Brick Red to Brownish-Red; Luster: Vitreous to Waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep Brick Red to Brownish-Red
- Luster
- Vitreous to Waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep Brick Red to Brownish-Red; Luster: Vitreous to Waxy; Crystal Structure: 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, with oxygenation of iron inclusions creating the red color. Often found in Banded Iron Formations or as nodules in volcanic rocks.
Uses & applications
Used primarily for semi-precious jewelry (beads, cabochons), ornamental carvings, paperweights, and as a popular stone for lapidary tumbling and metaphysical collections.
Geological facts
Jasper has been a favorite gemstone since antiquity; it is mentioned in the Bible and was used by ancient Minoans and Egyptians for seals and talismans. Its name is derived from the Greek 'iaspis', meaning spotted stone.
Field identification & locations
Identify by its opaque nature (it does not let light through even at the edges), smooth texture when polished, and characteristic dull red streak. Common in riverbeds and desert environments globally, notably in India, Brazil, and the USA.
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