igneous
Quartz vein in pink granite
Granite intersected by a hydrothermal quartz vein; quartz SiO₂, with feldspar and mica
AI-generated identification · may be incorrectGranite is coarse-grained, pink, and speckled, while the vein consists of translucent to milky quartz crystals with a glassy luster and irregular fracture. Quartz hardness is 7; feldspar is about 6, and mica is 2–3; no obvious cleavage is visible in the quartz.
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Physical properties
Granite is coarse-grained, pink, and speckled, while the vein consists of translucent to milky quartz crystals with a glassy luster and irregular fracture. Quartz hardness is 7; feldspar is about 6, and mica is 2–3; no obvious cleavage is visible in the quartz.
Formation & geological history
The granite crystallized slowly from silica-rich magma deep underground, likely millions to billions of years ago. Later, hot silica-bearing fluids exploited a fracture and deposited the quartz vein as the rock cooled and uplifted.
Uses & applications
Common granite is used for dimension stone, paving, aggregate, and monuments; quartz-rich material is chiefly a geological or landscaping specimen. Attractive pieces may be collected, though this example appears primarily field-grade.
Geological facts
The sharp boundary between pink host rock and pale crystalline material records fluid movement through a pre-existing fracture. Dark flakes are likely biotite mica, while the pink color commonly comes from potassium feldspar.
Field identification & locations
Identify it by interlocking visible grains, pink feldspar, gray or clear quartz, and black mica, plus the contrasting coarse quartz vein. Similar granite–quartz-vein exposures occur worldwide, especially in old continental crust and mountainous regions.
