sedimentary
Jasper (Banded / Brecciated Jasper Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness 6.5-7 on Mohs scale; dull to waxy luster; reddish-brown color with swirling or veined patterns; microcrystalline structure; smooth, water-worn texture.
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Physical properties
Hardness 6.5-7 on Mohs scale; dull to waxy luster; reddish-brown color with swirling or veined patterns; microcrystalline structure; smooth, water-worn texture.
Formation & geological history
Formed when silica-rich fluid infiltrated fine-grained sediments or volcanic ash, combined with iron oxides that provided the reddish hues. Water-worn on a beach or riverbed.
Uses & applications
Used in lapidary arts, jewelry (cabochons, beads), decorative crafts, and as a popular beachcombing collectible.
Geological facts
Jasper is an opaque variety of chalcedony. Its intricate patterns and swirls often resemble miniature landscapes or abstract art.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by steel knife), opaque reddish-brown coloration, smooth texture, and characteristic pattern lines.
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