sedimentary
Red Jasper or Ferruginous Chert
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to terracotta tone with darker iron-rich micro-veinings, dull to earthy waxy luster, microcrystalline structure, conchoidal fracture, density around 2.65 g/cm³.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to terracotta tone with darker iron-rich micro-veinings, dull to earthy waxy luster, microcrystalline structure, conchoidal fracture, density around 2.65 g/cm³.
Formation & geological history
Formed through the precipitation of microcrystalline silica combined with iron oxides in marine sedimentary deposits or hydrothermally altered rock beds, shaped and rounded through stream or river erosion.
Uses & applications
Used primarily as decorative specimens, lapidary cabochons, tumbled pocket stones, landscaping rock, and for educational collections.
Geological facts
Red jasper gains its characteristic brick-red hue from hematite (iron oxide) impurities dispersed throughout the quartz lattice.
Field identification & locations
Identified in the field by its hardness (scratches glass), smooth water-worn surface, non-porous microcrystalline texture, and rich reddish-brown color with dark veinlets. Commonly found in gravel beds, riverbanks, and glacial tills.
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