igneous
Polished orbicular granite (likely larvikite or granite egg)
Granite/larvikite; chiefly quartz, feldspar, and dark mafic minerals
AI-generated identification · may be incorrectMedium- to coarse-grained, pink-brown polished surface with black/gray mineral patches and possible feldspar orbicules; Mohs hardness about 6–7, vitreous to dull luster, interlocking crystalline texture, no obvious cleavage as a whole rock. The rounded egg shape is human-carved and polished.
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Physical properties
Medium- to coarse-grained, pink-brown polished surface with black/gray mineral patches and possible feldspar orbicules; Mohs hardness about 6–7, vitreous to dull luster, interlocking crystalline texture, no obvious cleavage as a whole rock. The rounded egg shape is human-carved and polished.
Formation & geological history
Slow cooling of silica-rich magma produced the crystalline igneous texture, generally during Precambrian to Phanerozoic plutonic events; exact age and locality cannot be determined from the image.
Uses & applications
Used as a decorative stone, worry stone, paperweight, or gift item; not typically suitable for fine jewelry. Common commercial pieces are inexpensive.
Geological facts
The dark speckles may be biotite, amphibole, or pyroxene, while pink areas are potassium feldspar; visual identification is limited because polishing obscures grain boundaries.
Field identification & locations
Identify by its granular interlocking crystals, natural color variation, and absence of glassy uniformity; common sources include India, Madagascar, Norway, Brazil, and China. A streak, hardness, and locality label would improve identification.
