sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite inclusions
Hardness: 6.5-7 on the Mohs scale. Color: Dull brick-red to brownish-red with light cream/tan patches. Luster: Vitreous to dull/earthy. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
- Hardness
- 6
- Color
- Dull brick-red to brownish-red with light cream/tan patches
- Luster
- Vitreous to dull/earthy
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Dull brick-red to brownish-red with light cream/tan patches. Luster: Vitreous to dull/earthy. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
Formation & geological history
Forms when silica-rich fluid infills cavities in sedimentary or volcanic rocks, incorporating fine iron oxide (hematite) particles which give it its characteristic red coloration.
Uses & applications
Used extensively for lapidary work, decorative cabochons, tumbled stones, polished pebbles, and ornamental carvings.
Geological facts
Jasper has been used as gemstones and seals since ancient times. The red color is caused by trace amounts of hematite (iron oxide) spread evenly throughout the microcrystalline quartz matrix.
Field identification & locations
Identified by its rich red hue, hardness (will scratch glass), smooth waxy-to-dull feel, and lack of translucent banding (unlike agate). Commonly found in gravel beds, riverbanks, and ancient volcanic terrain worldwide.
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