igneous
Granite with Pegmatite Dike
Phaneritic Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, granular texture, composed of interlocking quartz, feldspar, and biotite crystals with a visibly coarser pegmatitic vein running through it.
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Physical properties
Hardness of 6 on the Mohs scale, granular texture, composed of interlocking quartz, feldspar, and biotite crystals with a visibly coarser pegmatitic vein running through it.
Formation & geological history
Formed from the slow cooling of magma deep beneath the Earth's crust, with the central vein created by late-stage hydrothermal fluids crystallizing rapidly into larger minerals.
Uses & applications
Used extensively in construction, architectural facings, monuments, and countertops due to its durability and aesthetic appeal.
Geological facts
Pegmatite dikes often host rare minerals and gem-quality crystals because of the high concentration of water and rare elements during their formation.
Field identification & locations
Identify by the distinct contrast between the fine-grained host granite and the very coarse crystals in the central dike; commonly found in continental shields and mountain roots.
