igneous
Polished feldspar-rich granite
Granite, primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectLight gray-white, coarse crystalline, with translucent/opaque feldspar and brownish iron-oxide staining; vitreous to pearly luster. Hardness about 6–7 Mohs, no cleavage as a rock, and specific gravity roughly 2.6–2.7.
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Physical properties
Light gray-white, coarse crystalline, with translucent/opaque feldspar and brownish iron-oxide staining; vitreous to pearly luster. Hardness about 6–7 Mohs, no cleavage as a rock, and specific gravity roughly 2.6–2.7.
Formation & geological history
A plutonic igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic continental mountain-building. The piece is cut and polished, with staining from later weathering or hydrothermal alteration.
Uses & applications
Widely used for countertops, monuments, tiles, building stone, and decorative objects; polished specimens are inexpensive geological or lapidary pieces.
Geological facts
The pale blocky grains are likely feldspar, while glassier gray areas may be quartz; exact identification would require a hand lens or mineral tests.
Field identification & locations
Common in continental mountain belts worldwide, including India, Brazil, Scandinavia, and North America. Look for interlocking visible crystals, feldspar cleavage, quartz lacking cleavage, and a scratch resistance near 6–7 Mohs.
