sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red with occasional black streaks, Luster: Vitreous to dull when unpolished, Crystal Structure: Trigonal (Microcrystalline), 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 with occasional black streaks, Luster: Vitreous to dull when unpolished, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica in sedimentary or volcanic rock layers, where mineral-rich water deposits microcrystalline quartz. The red color is derived from high iron content (hematite inclusions).
Uses & applications
Predominantly used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for rock tumbling and decorative landscaping.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Hebrew, Assyrian, Greek, and Latin. It is often referred to as the 'Stone of Endurance' in metaphysical circles.
Field identification & locations
Identify by its waxy to vitreous luster, extreme hardness (it will scratch glass), and its opaque nature even when held to a light source. Commonly found in large deposits in India, Brazil, Madagascar, and the USA.
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