sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red, maroon, or brownish-red; Luster: Dull to waxy when raw; Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal); Cleavage: None; Opaque.
- Hardness
- 6
- Color
- Deep red, maroon, or brownish-red
- Luster
- Dull to waxy when raw
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red, maroon, or brownish-red; Luster: Dull to waxy when raw; Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal); Cleavage: None; Opaque.
Formation & geological history
Formed through the accumulation of fine silica and volcanic ash or clay, colored by hematite (iron) inclusions. Most jasper deposits date back to the Precambrian or Paleozoic eras.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons, beads), decorative ornaments, and widely collected as pocket stones or metaphysical tools.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning spotted stone. It has been used since antiquity for royal seals and amulets. It is often referred to as the 'Supreme Nurturer' in gemstone folklore.
Field identification & locations
Identify by its rich red color, opacity (it will not let light through even at the edges), and smooth, dull texture that can take a high polish. Commonly found in riverbeds or coastal areas in India, Brazil, and the Southwestern United States.
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