sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically brown, yellow, red, or green in color, with a waxy to dull luster. It has a cryptocrystalline structure and conchoidal fracture with no cleavage. Specific gravity ranges from 2.55 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically brown, yellow, red, or green in color, with a waxy to dull luster. It has a cryptocrystalline structure and conchoidal fracture with no cleavage. Specific gravity ranges from 2.55 to 2.91.
Formation & geological history
Formed through the deposition and precipitation of silica-rich fluids in sedimentary basins or volcanic environments, often during ancient hydrothermal activity or silica replacement of other materials over millions of years.
Uses & applications
Commonly used in lapidary arts, ornamental carvings, jewelry making, and as a collectible gemstone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads. Its name derives from the Greek word iaspe, meaning 'spotted stone'.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and mountainous regions. It is easily identified in the field by its smooth, water-worn texture, opaque nature, rich earthy colors, and distinct conchoidal fracture.
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