sedimentary or metamorphic
Jasper and Quartzite mix
Silicon Dioxide (SiO2) with impurities
Hardness of 6.5-7 on the Mohs scale. Opaque to translucent luster, predominantly white and greenish-grey coloring with a waxy or dull waxy surface texture. Cryptocrystalline structure.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Opaque to translucent luster, predominantly white and greenish-grey coloring with a waxy or dull waxy surface texture. Cryptocrystalline structure.
Formation & geological history
Formed through the accumulation of silica in sedimentary environments or the metamorphism of quartz-rich sandstone. These materials often date back millions of years and occur in areas with significant geological activity or ancient sea beds.
Uses & applications
Used primarily for decorative purposes, lapidary work (cabs and beads), landscaping, and as a durable construction aggregate for roads and foundations in its raw form.
Geological facts
Jasper is often referred to as the 'Supreme Nurturer.' It is a form of chalcedony that contains up to 20% foreign materials which determine its unique color and patterns. This specific specimen appears to be water-worn or weathered, giving it a rounded, river-rock appearance.
Field identification & locations
Commonly found in riverbeds, glacial deposits, and gravel pits. To identify in the field, use a scratch test (it should scratch glass but not be scratched by a steel knife) and look for a conchoidal fracture pattern. Collectors should look for unique banding or vivid color contrast.
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Other sedimentary or metamorphic specimens
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary