igneous
Granite countertop with a small pale mineral fragment
Granite; predominantly quartz, feldspar, and mica
AI-generated identification · may be incorrectThe background is polished, coarse-grained granite with dark gray/black minerals and pink potassium feldspar. Granite has Mohs hardness about 6–7, vitreous luster, interlocking crystals, and no dominant cleavage; the small white fragment appears consistent with quartz or feldspar.
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Physical properties
The background is polished, coarse-grained granite with dark gray/black minerals and pink potassium feldspar. Granite has Mohs hardness about 6–7, vitreous luster, interlocking crystals, and no dominant cleavage; the small white fragment appears consistent with quartz or feldspar.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep in the continental crust, commonly during Precambrian to Mesozoic geologic events. The polished slab is human-processed architectural stone.
Uses & applications
Used extensively for countertops, monuments, flooring, and building stone; quality decorative slabs commonly sell for about $40–$150 per square foot installed. The small fragment has negligible commercial value, typically under $1.
Geological facts
Pink coloration generally comes from potassium feldspar, while dark patches may contain biotite, hornblende, or accessory magnetite. Granite’s visible crystals indicate slow underground cooling.
Field identification & locations
Identify it by its speckled, interlocking texture, lack of layering, and pink feldspar; a glassy scratch-resistant grain suggests quartz. Common sources include India, Brazil, China, Canada, and the United States.
