igneous
Polished orbicular granite (likely K2 granite or a related mottled granitoid)
Quartz–feldspar–amphibole granitoid; exact identification requires testing
AI-generated identification · may be incorrectFine-to-medium-grained, rounded and polished, with mottled cream, tan, gray, and dark minerals. Likely Mohs 6–7; quartz and feldspar have vitreous luster, while dark amphibole or biotite is duller; interlocking crystals have no prominent cleavage surfaces.
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Physical properties
Fine-to-medium-grained, rounded and polished, with mottled cream, tan, gray, and dark minerals. Likely Mohs 6–7; quartz and feldspar have vitreous luster, while dark amphibole or biotite is duller; interlocking crystals have no prominent cleavage surfaces.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible crystals to grow; the rock may be hundreds of millions to billions of years old. Its rounded shape and sheen come from later natural abrasion or polishing.
Uses & applications
Used mainly as a pocket stone, decorative specimen, or lapidary material; similar granitoids are also used as building and dimension stone.
Geological facts
The striking patches are likely contrasting mineral grains, not necessarily fossils or separate “spots” formed at the surface.
Field identification & locations
Look for hard, interlocking grains and a speckled pattern; a glass scratch test or mineral identification can help distinguish granite from other mottled stones. Similar granitoids occur worldwide; K2-type material is associated with Pakistan’s Karakoram region.
