sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Deep red with yellow and brown streaks; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red with yellow and brown streaks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep red with yellow and brown streaks; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.91
Formation & geological history
Formed primarily in sedimentary environments where silica-rich fluids permeate through volcanic ash or sediment, often associated with Banded Iron Formations. The red color is caused by the inclusion of iron oxides (Hematite).
Uses & applications
Used extensively as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and historically for tools and seal stones.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'rain-bringer' in ancient civilizations and was frequently used in the amulets of ancient Egypt.
Field identification & locations
Identify in the field by its waxy to dull luster, lack of cleavage, and extreme hardness (it will scratch glass). It is commonly found in riverbeds, deserts, or areas with high volcanic and sedimentary activity.
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