sedimentary
Red Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque red to brownish-red color, waxy to vitreous luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque red to brownish-red color, waxy to vitreous luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich sediments or volcanic ash, heavily pigmented by iron oxides during hydrothermal alteration or chemical precipitation, often in marine environments over millions of years.
Uses & applications
Commonly used for tumbled stones, cabochons, ornamental carvings, jewelry making, and lapidary art.
Geological facts
Red jasper has been used since ancient times for amulets, seals, and weaponry components. Its deep red color is primarily due to microscopic hematite inclusions.
Field identification & locations
Easily identified by its opaque red color, high hardness that scratches glass, and smooth waxy feel when tumbled. Found globally, especially in regions with ancient volcanic or sedimentary deposits.
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