sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, colors vary widely (red, brown, green, yellow) due to iron and other mineral impurities, waxy to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and specific gravity around 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, colors vary widely (red, brown, green, yellow) due to iron and other mineral impurities, waxy to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and specific gravity around 2.58-2.91.
Formation & geological history
Formed through the accumulation of silica-rich sediments or the alteration of silica-rich volcanic ash and hydrothermal deposits, often occurring in marine environments over millions of years.
Uses & applications
Commonly used for making ornamental objects, carved figurines, cabochons, jewelry, and as a polished collector's specimen.
Geological facts
Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy luster, opaque nature, and smooth conchoidal fracture. Found worldwide in regions with past volcanic or sedimentary activity.
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