igneous
Dalmatian jasper (Dalmatian stone)
Feldspar-rich porphyritic igneous rock, commonly sold as Dalmatian jasper; dark spots are mainly amphibole and/or tourmaline minerals
AI-generated identification · may be incorrectCreamy tan matrix with distinctive black spots; opaque, typically polished and rounded. Hardness is about 6–7 Mohs, with a fine-grained feldspar-rich groundmass; exact composition cannot be confirmed from the photo.
Identified More igneous →
Explore Dalmatian jasper (Dalmatian stone) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Creamy tan matrix with distinctive black spots; opaque, typically polished and rounded. Hardness is about 6–7 Mohs, with a fine-grained feldspar-rich groundmass; exact composition cannot be confirmed from the photo.
Formation & geological history
Forms as an evolved, silica-rich igneous rock with dark accessory minerals; commercial material is chiefly quarried in Chihuahua, Mexico. The specimen’s geological age cannot be determined visually.
Uses & applications
Used for tumbled stones, beads, carvings, and decorative objects; the pictured piece appears to be a polished pebble.
Geological facts
Despite its trade name, it is generally not jasper, which is a variety of microcrystalline quartz.
Field identification & locations
Look for an opaque pale matrix with scattered, sharply contrasting black spots; this appearance is characteristic, though not diagnostic of exact mineral composition.
