sedimentary
Jasper with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Goethite
Hardness 6.5-7 (Mohs), colors range from dull green/blue-grey to rusty red/brown, dull to waxy luster, microcrystalline structure, conchoidal fracture, specific gravity 2.5-2.9.
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Physical properties
Hardness 6.5-7 (Mohs), colors range from dull green/blue-grey to rusty red/brown, dull to waxy luster, microcrystalline structure, conchoidal fracture, specific gravity 2.5-2.9.
Formation & geological history
Formed through the deposition of silica from hydrothermal fluids or volcanic ash in sedimentary environments, often associated with iron-rich deposits during the Proterozoic or Paleozoic eras.
Uses & applications
Used primarily as decorative lapidary material, for jewelry (cabochons), as metaphysical stones, and historically for tools due to its hardness and fracture pattern.
Geological facts
Jasper is an opaque variety of chalcedony. The red streak in this specimen is likely caused by the presence of iron oxide (hematite or goethite) filling a fracture or forming a distinct layer within the silica.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel knife) and its smooth, river-worn surface. Commonly found in riverbeds, glacial tills, and coastal beaches where silica-rich rocks have weathered out.
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