igneous

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

Hardness: 6-7 on Mohs scale. Color: Mottled grey, pink, and white. Luster: Vitreous to dull. Structure: Phaneritic (coarse-grained). Cleavage: Imperfect/Absent in rock mass. Specific Gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled grey, pink, and white
Luster: Vitreous to dull

Identified March 16, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below the Earth's surface (intrusive). Common across all geological ages, especially in continental crust and mountain-building regions.

Uses & applications

Extensively used in construction (countertops, flooring), monuments, curbing, and as crushed stone for road base and aggregate.

Geological facts

Granite is the primary rock of the Earth's continental crust. Mount Rushmore is carved into a granite batholith, and Yosemite's Half Dome is a massive granite monolith.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals of quartz and feldspar. Found globally in continental shields and mountain belts. For collectors, look for unique textures like pegmatites or rare mineral inclusions.

Other igneous specimens

See all

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral