igneous
Pink granite cobble
Granite, chiefly quartz–alkali feldspar–plagioclase with minor biotite or iron oxides
AI-generated identification · may be incorrectRounded, fine- to medium-grained, pale pink rock with dark speckling and a dull granular luster. Granite typically has Mohs hardness 6–7, no cleavage as a whole, interlocking crystals, and specific gravity about 2.6–2.7.
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Physical properties
Rounded, fine- to medium-grained, pale pink rock with dark speckling and a dull granular luster. Granite typically has Mohs hardness 6–7, no cleavage as a whole, interlocking crystals, and specific gravity about 2.6–2.7.
Formation & geological history
Intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally during Precambrian or younger continental magmatism. Its rounded shape indicates glacial, river, or landscaping abrasion.
Uses & applications
Used widely as building stone, paving aggregate, monuments, countertops, and decorative landscaping rock; this individual cobble has little commercial value.
Geological facts
The pink color usually comes from potassium feldspar, while black flecks are commonly biotite, amphibole, or iron-stained minerals. Exact identification is limited because the photograph does not resolve individual crystals clearly.
Field identification & locations
Commonly found as glacial erratics and stream cobbles around western Russia, including the Smolensk region near the reported location. Look for visible interlocking quartz and feldspar grains, hardness sufficient to scratch glass, and lack of layering or foliation.
