igneous
Leopard Skin Rhyolite / Spherulitic Rhyolite
Extrusive igneous rock with quartz and feldspar spherulites
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, vitreous to dull luster, dense aphanitic groundmass with distinct rounded spherulites of pink, white, or grey.
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Physical properties
Hardness of 6 on the Mohs scale, vitreous to dull luster, dense aphanitic groundmass with distinct rounded spherulites of pink, white, or grey.
Formation & geological history
Formed through the rapid cooling and crystallization of silica-rich lava on Earth's surface, often during volcanic activity.
Uses & applications
Used primarily as a decorative ornamental stone, in lapidary arts, and for making polished display specimens or gemstone jewelry.
Geological facts
The distinctive circular patterns are called spherulites, which grow radially from a central point as microcrystalline quartz and feldspar cool rapidly.
Field identification & locations
Easily identified by its dark fine-grained volcanic matrix filled with contrasting rounded orbicular spots. Commonly found in volcanic regions worldwide.
