sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to pinkish color, dull to waxy luster, conchoidal fracture, and specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to pinkish color, dull to waxy luster, conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids precipitate microcrystalline quartz in pore spaces or fractures, often found in ancient riverbeds or marine deposits.
Uses & applications
Used for decorative objects, cabochons in jewelry, and tumbled stones for lapidary work.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, highly valued by ancient civilizations including the Minoans and Egyptians.
Field identification & locations
Easily identified by its opaque nature, hardness that scratches glass, and waxy luster. Common in stream gravels and beaches worldwide.
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