sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including green, red, brown, and yellow, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including green, red, brown, and yellow, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity around 2.58 to 2.91.
Formation & geological history
Forms from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often replacing existing rock materials. Can be millions of years old.
Uses & applications
Used for ornamental objects, cabochons, carvings, and collector specimens.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and various ornaments. Its name means 'spotted or speckled stone'.
Field identification & locations
Found worldwide in riverbeds, beaches, and mountainous regions. Identified by its smooth water-worn surface, opaque nature, and lack of cleavage.
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