igneous
Granite countertop slab
Granite; primarily quartz, feldspar, and mica (commonly biotite), with accessory amphibole/iron oxides
AI-generated identification · may be incorrectCoarse-grained, crystalline, tan-gold with black and gray minerals; vitreous quartz, feldspar luster, no prominent cleavage as a rock, Mohs hardness about 6–7, density roughly 2.6–2.8 g/cm³. The rounded edge and polished surface indicate human processing.
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Physical properties
Coarse-grained, crystalline, tan-gold with black and gray minerals; vitreous quartz, feldspar luster, no prominent cleavage as a rock, Mohs hardness about 6–7, density roughly 2.6–2.8 g/cm³. The rounded edge and polished surface indicate human processing.
Formation & geological history
Intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally over millions of years; its exact geological age and quarry source cannot be determined from the image.
Uses & applications
Widely used for countertops, monuments, flooring, and building facades because it is durable, heat-resistant, and polishable; this is architectural-grade material rather than a typical collector specimen.
Geological facts
The black streaks and aligned mineral bands may indicate gneissic texture or a decorative granite marketed commercially as granite. Commercial stone names do not always match strict geological classifications.
Field identification & locations
Identify it by visible interlocking grains of quartz and feldspar, abundant mica or dark minerals, lack of layering typical of sedimentary rock, and resistance to scratching by a steel blade. Common sources include quarries in Brazil, India, China, and North America.
