igneous
Rainforest Jasper
Rhyolite (Spherulitic Rhyolite)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, with a vitreous to dull luster and a cryptocrystalline structure. Displays distinct orbicular or spherulitic patterns of green, brown, cream, and yellow colors.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, with a vitreous to dull luster and a cryptocrystalline structure. Displays distinct orbicular or spherulitic patterns of green, brown, cream, and yellow colors.
Formation & geological history
Formed from silica-rich volcanic lava that cooled rapidly, causing minerals to crystallize in radial, spherical clusters called spherulites.
Uses & applications
Primarily used for lapidary arts, cabochons, carved decorative objects, and collector specimens.
Geological facts
Despite its trade name 'Rainforest Jasper', it is actually a type of volcanic rhyolite rather than a true microcrystalline quartz jasper.
Field identification & locations
Identified by its characteristic green matrix speckled with cream or tan orbicular spherulites; commonly sourced from Western Australia.
