sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline quartz, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline quartz, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich fluids in volcanic ash or sedimentary beds. The red color is caused by the oxidation of iron (hematite) during its formation several million years ago.
Uses & applications
Commonly used in lapidary for cabochons, beads, and decorative carvings. It is popular in jewelry and used as an ornamental stone in polished finishes.
Geological facts
Jasper is known as the 'Supreme Nurturer' in folklore. Its red color is so stable that it doesn't fade over time. It is frequently opaque and often contains small veins or spots of other minerals.
Field identification & locations
Identify it by its smooth, waxy texture when polished, its high hardness (it cannot be scratched by a steel knife), and its characteristic deep red opacity. Found globally, with significant deposits in India, Brazil, and the USA.
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