igneous

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Hardness: 6-7 Mohs; Color: Pink, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63-2.75

Hardness: 6-7 Mohs
Color: Pink, white, and grey
Luster: Vitreous to dull

Identified March 5, 2026More igneous →

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Physical properties

Hardness: 6-7 Mohs; Color: Pink, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63-2.75

Formation & geological history

Formed by the slow crystallization of magma below the Earth's surface (intrusive). The pink color comes from an abundance of potassium feldspar (orthoclase). These formations can range from millions to billions of years old.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. High-quality specimens are popular for rock collections and educational purposes.

Geological facts

Pink granite is often the state rock of various regions, such as Missouri (Elephant Rocks). The specific pink hue is a result of the chemical composition of the magma, specifically high levels of potassium-rich minerals.

Field identification & locations

Identified by its visible interlocking crystals of pink feldspar and translucent quartz. Common in continental crust and mountain ranges like the Rockies or the Appalachians. Collectors should look for distinct large crystals.

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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.

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Magnetite

Iron(II,III) oxide (Fe3O4)

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Sodalite - Na8(Al6Si6O24)Cl2

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

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Magnetite

Magnetite (Fe3O4)

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