igneous
Polished orbicular granite (likely K2-type granite)
Granite, chiefly quartz, alkali feldspar, plagioclase, and dark amphibole/biotite; possible epidote-rich orbicules
AI-generated identification · may be incorrectMedium- to coarse-grained, mottled green, pink, cream, and black, with a granular texture and subdued polished luster. Hardness about 6–7 Mohs; crystals are interlocking, with no prominent cleavage as a whole; density typically 2.6–2.8 g/cm³.
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Physical properties
Medium- to coarse-grained, mottled green, pink, cream, and black, with a granular texture and subdued polished luster. Hardness about 6–7 Mohs; crystals are interlocking, with no prominent cleavage as a whole; density typically 2.6–2.8 g/cm³.
Formation & geological history
A slowly cooled intrusive felsic magma formed deep in the continental crust, probably during a Precambrian to Paleozoic plutonic event; green coloration commonly reflects epidote, amphibole, or altered feldspar. The rounded shape and sheen indicate human polishing.
Uses & applications
Used as a decorative stone, cabochon, palm stone, and collector specimen; granite is also widely used for countertops, monuments, tiles, and aggregate.
Geological facts
Orbicular granites contain rounded mineral-rich patches formed by unusual crystallization around nuclei in a cooling magma. Similar green-and-pink material is marketed as K2 stone, although exact locality and mineralogy require testing.
Field identification & locations
Identify by its interlocking quartz-feldspar texture, lack of layering, and scattered dark or green mineral patches; a glassy surface, acid test, thin section, or Raman/XRF analysis can confirm composition. Comparable rocks occur in granitic terrains worldwide, especially South Asia and Scandinavia.
