igneous

Pink Granite

Felsic intrusive igneous rock (composition: SiO2 and Al2O3)

Hardness: 6-7 on Mohs scale; Color: Pink, reddish-pink with black and grey specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75.

Hardness: 6-7 on Mohs scale
Color: Pink, reddish-pink with black and grey specks
Luster: Vitreous to dull

Identified March 14, 2026More igneous →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Pink, reddish-pink with black and grey specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75.

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground (plutonic). Its pink color comes from a high concentration of Potassium Feldspar. Can range from Precambrian to Cenozoic geological ages.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, and monuments (gravestones). High-quality specimens are also used in decorative architectural facades.

Geological facts

Mount Rushmore is carved from a granite batholith. Granite is the defining rock of Earth's continental crust; it is rare to find granite on other planets within our solar system.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance with prominent pink minerals (orthoclase feldspar), clear/grey glass-like quartz, and black flakes (biotite or hornblende). Found globally in mountainous regions and shield areas like the Canadian Shield.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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)

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Blue Apatite

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

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Magnetite

Magnetite (Fe3O4)

mineral