igneous
Granite
Granite: coarse-grained intrusive rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectPale pink, white, and gray with black mineral flecks; visibly coarse-grained and crystalline, with a granular texture. Typical hardness is about 6–7 Mohs; no single cleavage, though its component minerals have their own cleavage.
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Physical properties
Pale pink, white, and gray with black mineral flecks; visibly coarse-grained and crystalline, with a granular texture. Typical hardness is about 6–7 Mohs; no single cleavage, though its component minerals have their own cleavage.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing large crystals to grow. Its age cannot be determined from the image; granites range from recent to billions of years old.
Uses & applications
Used for building stone, countertops, paving, monuments, and decorative or educational specimens.
Geological facts
The pink grains are likely potassium feldspar, the light grains quartz and feldspar, and the dark flecks commonly biotite or hornblende.
Field identification & locations
The visible interlocking crystals support a granite identification. Granite is widespread in continental crust; the reported coastal northeastern Brazil location is regionally plausible, though the precise source cannot be established from the image. A small common specimen typically sells for about $1–$10 USD.
