igneous
Dalmatian jasper (often sold as Dalmatian stone)
Quartz- and feldspar-rich porphyritic volcanic rock; the trade name “Dalmatian jasper” is not a formal mineral species
AI-generated identification · may be incorrectCream-white to beige matrix with dark spots and patches; typically opaque, with a fine-grained groundmass and scattered crystals. Hardness is roughly 6–7 Mohs; exact composition and texture vary by source.
Identified More igneous →
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Physical properties
Cream-white to beige matrix with dark spots and patches; typically opaque, with a fine-grained groundmass and scattered crystals. Hardness is roughly 6–7 Mohs; exact composition and texture vary by source.
Formation & geological history
A volcanic rock formed as silica-rich magma cooled, with larger mineral grains crystallizing before the remaining melt solidified. Its geological age depends on the deposit; the pictured polished pebble cannot be dated visually.
Uses & applications
Used for polished beads, cabochons, carvings, and decorative objects; not generally an industrial stone.
Geological facts
Despite the name, it is not true jasper, which is a variety of microcrystalline quartz. The dark markings are mineral inclusions rather than painted spots in genuine material.
Field identification & locations
The spotted cream-and-black pattern is characteristic in the gemstone trade, but visual identification alone cannot confirm the exact rock. Similar material is commonly sourced from Chihuahua, Mexico; this appears to be a small polished specimen.
