sedimentary (secondary formation)
Red Jasper (possibly Petrified Wood)
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to brownish-red with banding; Luster: Vitreous to waxy; Structure: Microcrystalline (Cryptocrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Terracotta red to brownish-red with banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to brownish-red with banding; Luster: Vitreous to waxy; Structure: Microcrystalline (Cryptocrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed when silica-rich fluids permeate porous sediment or organic material (like wood) and crystallize. Often found in volcanic ash beds or sedimentary deposits where iron oxide provides the red pigmentation.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and decorative carvings. Highly valued as a 'healing stone' in metaphysical circles and as a landscaping ornamental.
Geological facts
Jasper is an opaque variety of chalcedony. The red color is caused by trace amounts of Iron (Hematite). In ancient times, it was known as the 'rain-bringer' and was used in the breastplate of the High Priest in biblical history.
Field identification & locations
Identify in the field by its opacity (does not let light through even on edges), its hardness (will scratch glass), and its characteristic smooth, waxy feel when polished by water in stream beds. Commonly found in desert regions of the SW USA, India, and Brazil.
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