sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brick-red color, dull to waxy luster, trigonal crystal system (microcrystalline), 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, reddish-brown to brick-red color, dull to waxy luster, trigonal crystal system (microcrystalline), conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91
Formation & geological history
Formed through the chemical precipitation of silica in silica-rich marine environments or hydrothermal solutions, often associated with banded iron formations dating from the Precambrian era (over 500 million to over 2 billion years ago)
Uses & applications
Used in ornamental carvings, cabochons, polished tumbled stones, jewelry making, and lapidary arts
Geological facts
Red jasper has been used since ancient times for talismans, seals, and weaponry components. Its intense red color is due to the presence of hematite and clay impurities within the quartz matrix
Field identification & locations
Easily identified in the field by its opaque brick-red color, conchoidal fracture, and hardness that scratches glass. Found worldwide, with significant deposits in India, Brazil, Russia, and the United States
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