igneous
Granite or granitic rock fragment
Granite; primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectLight gray, granular texture with a dull-to-glassy luster; likely Mohs hardness 6–7, massive with no prominent cleavage as a whole, and specific gravity about 2.6–2.7. The image suggests fine- to medium-grained quartz-feldspar material, though exact identification is limited by lighting and resolution.
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Physical properties
Light gray, granular texture with a dull-to-glassy luster; likely Mohs hardness 6–7, massive with no prominent cleavage as a whole, and specific gravity about 2.6–2.7. The image suggests fine- to medium-grained quartz-feldspar material, though exact identification is limited by lighting and resolution.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. Weathering and erosion produced this rounded fragment.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and building material; small natural specimens have modest collecting interest.
Geological facts
Granite is an intrusive igneous rock and commonly contains visible interlocking crystals of quartz, feldspar, and mica. Its rounded shape indicates transport or abrasion after weathering.
Field identification & locations
Look for interlocking light and dark mineral grains, substantial weight, and lack of layering or bubbles; a glassy quartz grain and feldspar cleavage help distinguish it from quartzite or limestone. Common worldwide, especially in continental mountain belts.
