sedimentary
Jasper
Silicon dioxide (SiO2) microcrystalline quartz
AI-generated identification · may be incorrectHardness 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including green, brown, and red, and a fine-grained crystal structure.
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Physical properties
Hardness 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including green, brown, and red, and a fine-grained crystal structure.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, often precipitating from silica-rich hydrothermal solutions or seawater over millions of years.
Uses & applications
Commonly used for ornamental carvings, polished cabochons in jewelry, and geological specimen collecting.
Geological facts
Jasper has been utilized by ancient civilizations since the 4th millennium BC for making seals, drills, and primitive jewelry.
Field identification & locations
Easily identified in the field by its conchoidal fracture, lack of cleavage, waxy luster, and high scratch resistance on glass. Found worldwide in riverbeds and mountainous terrain.
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Sandstone or Siltstone
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Sandstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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