sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, varies in color including red, brown, yellow, green, and purple, has a waxy to dull luster, and a cryptocrystalline crystal structure with conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, varies in color including red, brown, yellow, green, and purple, has a waxy to dull luster, and a cryptocrystalline crystal structure with conchoidal fracture.
Formation & geological history
Formed through the silica-rich precipitation in marine environments or hydrothermal solutions, often replacing organic material or filling cavities in volcanic rocks over millions of years.
Uses & applications
Used primarily in lapidary arts for making cabochons, beads, ornamental carvings, and collector specimens.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its diverse patterns and colors are caused by varying mineral impurities such as iron oxides and clay.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), opaque nature, smooth waxy feel, and conchoidal fracture. Commonly found in riverbeds, ancient volcanic regions, and sedimentary deposits worldwide.
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