sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Brick red to deep terracotta
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58–2.91.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, where iron oxide (hematite) provides the red color. Typically found in Precambrian or Paleozoic formations.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Also used historically for seals, amulets, and as a decorative stone in mosaics.
Geological facts
Jasper is an opaque variety of chalcedony. Historically known as the 'supreme nurturer' in metaphysical circles, it has been used by ancient civilizations like the Egyptians and Minoans for centuries.
Field identification & locations
Identify in the field by its opaque nature (unlike translucent carnelian), smooth conchoidal fracture, and inability to be scratched by a steel knife. Common in diverse locations including Africa, Brazil, India, and the USA.
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