igneous
Granite-like rock
Coarse-grained felsic intrusive rock, likely granite or granodiorite
AI-generated identification · may be incorrectHardness about 6–7 Mohs; mottled gray-white with dark minerals, granular texture, and dull to vitreous mineral luster. Likely composed of interlocking quartz, feldspar, and biotite or hornblende; no visible cleavage at the hand-sample scale.
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Physical properties
Hardness about 6–7 Mohs; mottled gray-white with dark minerals, granular texture, and dull to vitreous mineral luster. Likely composed of interlocking quartz, feldspar, and biotite or hornblende; no visible cleavage at the hand-sample scale.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, commonly during Precambrian to younger continental mountain-building events. The exact age and rock name require a fresh surface or laboratory analysis.
Uses & applications
Used as building stone, aggregate, monuments, countertops, and dimension stone; this small irregular specimen has mainly educational or modest collecting value.
Geological facts
Quartz appears glassy or gray, feldspar is commonly white, and dark grains are mica or amphibole. The image is insufficient to distinguish granite confidently from granodiorite or another coarse crystalline rock.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Identify it by its visible interlocking crystals and lack of layering; a streak, hardness, and acid test can help, but a fresh broken face is most useful.
