igneous
Granite countertop
Coarse-grained granitoid, typically quartz + alkali feldspar + plagioclase + biotite/hornblende
AI-generated identification · may be incorrectHardness about 6–7 Mohs; speckled white, gray, and black appearance, granular texture, and vitreous-to-dull luster. Interlocking crystals show no obvious layering or cleavage as a whole rock; density is roughly 2.6–2.8 g/cm³.
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Physical properties
Hardness about 6–7 Mohs; speckled white, gray, and black appearance, granular texture, and vitreous-to-dull luster. Interlocking crystals show no obvious layering or cleavage as a whole rock; density is roughly 2.6–2.8 g/cm³.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in the continental crust, generally during Precambrian to Phanerozoic events. The pictured material is quarried, cut, polished, and installed as a countertop.
Uses & applications
Widely used for countertops, monuments, flooring, building facades, and crushed stone; polished slabs are valued for durability and appearance. Common commercial varieties are practical architectural materials rather than high-value collector specimens.
Geological facts
Granite’s visible crystals indicate slow underground cooling, while its quartz and feldspar content gives it strong abrasion and weathering resistance. Exact commercial names may include “white granite,” though some slabs marketed as granite are technically quartz-rich gneiss or other granitoids.
Field identification & locations
Identify it by coarse interlocking crystals, abundant light feldspar/quartz, and scattered dark biotite or amphibole; unlike marble, it generally does not fizz with dilute acid. Common sources include India, Brazil, China, Italy, and the United States.
