sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, color ranges from reddish brown, yellow, to green, luster is vitreous to dull, crystal structure is trigonal (microcrystalline/cryptocrystalline), cleavage is none (conchoidal fracture), specific gravity is 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, color ranges from reddish brown, yellow, to green, luster is vitreous to dull, crystal structure is trigonal (microcrystalline/cryptocrystalline), cleavage is none (conchoidal fracture), specific gravity is 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions or deposits of radiolarian ooze, often in marine or volcanic environments, undergoing diagenesis and hydrothermal alteration over millions of years.
Uses & applications
Used for making jewelry, ornamental carvings, decorative objects, and as a polishing stone.
Geological facts
Jasper has been used throughout human history since ancient times for talismans, seals, and weapons like arrowheads due to its durability and sharp conchoidal fracture.
Field identification & locations
Identified by its opaque appearance, waxy luster, conchoidal fracture, and rich earthy colors; commonly found worldwide in riverbeds, coastal beaches, and ancient sedimentary formations.
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