sedimentary
Jasper
Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, vitreous to dull luster, opaque transparency, microcrystalline quartz structure with no cleavage, specific gravity of 2.55 to 2.91, exhibiting various colors including yellow, brown, red, and green due to mineral impurities.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, vitreous to dull luster, opaque transparency, microcrystalline quartz structure with no cleavage, specific gravity of 2.55 to 2.91, exhibiting various colors including yellow, brown, red, and green due to mineral impurities.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often replacing existing rock in a process called silicification over millions of years.
Uses & applications
Commonly used for ornamental objects, carvings, lapidary work, jewelry, and gemstone collecting.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components. Its name derives from the ancient Greek word iaspis, meaning 'spotted stone'.
Field identification & locations
Can be identified in the field by its conchoidal fracture, opaque appearance, and high hardness which scratches glass. Found worldwide in riverbeds, volcanic regions, and sedimentary deposits.
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