igneous

Granite (Pink/Red Granite)

Phaneritic Igneous Rock (primarily SiO2, KAlSi3O8, NaAlSi3O8)

Hardness: 6-7 on Mohs scale; Color: Mottled pink, grey, and black; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained) containing visible crystals of K-feldspar, quartz, and mica; Specific Gravity: 2.63-2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled pink, grey, and black
Luster: Dull to vitreous

Identified February 27, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling and solidification of molten magma deep beneath the Earth's surface (plutonic). Found in continental crust plates; can date back billions of years to the Precambrian era.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, and monuments. Also used as crushed stone/aggregate for road base and railway ballast.

Geological facts

Mt. Rushmore is carved into a granite batholith. The pink color in this specific specimen is caused by a high concentration of Potassium Feldspar (Orthoclase).

Field identification & locations

Identify in the field by the 'salt and pepper' or multicrystalline locked texture where grains are visible to the naked eye. Found globally in mountainous regions and shield areas like the Canadian Shield or the Scottish Highlands.

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

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral