igneous
Polished leopard-skin jasper (likely)
Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety is uncertain from the photo
AI-generated identification · may be incorrectTumbled, opaque stone with reddish-brown, cream, and gray mottling. Quartz hardness is 6.5–7 Mohs; typically vitreous to dull, with no visible crystal faces or cleavage and a fine-grained structure.
Identified More igneous →
Explore Polished leopard-skin jasper (likely) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Tumbled, opaque stone with reddish-brown, cream, and gray mottling. Quartz hardness is 6.5–7 Mohs; typically vitreous to dull, with no visible crystal faces or cleavage and a fine-grained structure.
Formation & geological history
Jasper forms when silica-rich fluids replace or fill spaces in host rock, often producing iron-stained patterns. It is commonly associated with volcanic settings; the specimen’s age and exact locality cannot be determined from appearance alone.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; polished specimens are popular with collectors.
Geological facts
“Leopard-skin jasper” is a trade name for patterned ornamental stones, and the name does not always indicate a single precise geological variety.
Field identification & locations
Look for opaque, fine-grained material with mottled or orbicular color patterns and no obvious cleavage. Similar jasper is found worldwide, including in volcanic regions; a locality label is needed to identify the variety confidently.
