sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque transparency, hexagonal crystal system (microcrystalline), conchoidal fracture, specific gravity of 2.58 to 2.91, displaying various earthy tones including red, brown, yellow, and green.

Identified August 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and compaction of silica-rich sediments or the alteration of silica-rich volcanic ash and hydrothermal deposits, often occurring in ancient marine environments or sedimentary basins.

Uses & applications

Widely used in ornamental carvings, cabochons for jewelry, decorative objects, and as a durable gemstone material for lapidary work.

Geological facts

Jasper has been utilized by ancient human civilizations since prehistoric times for creating tools, seals, and ornamental amulets due to its toughness and ability to take a high polish.

Field identification & locations

Easily identifiable in the field by its opacity, hardness that scratches glass, conchoidal fracture, and characteristic mottled or banded color patterns. Commonly found worldwide in riverbeds, alluvial deposits, and ancient sedimentary formations.

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Sandstone or Siltstone

Arenite (if sandstone)

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Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

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Quartz pebble

Silicon dioxide (SiO2)

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Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

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Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

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Sedimentary Sandstone

Arenite (Sedimentary Rock)

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