igneous

Pink Granite

Granite (Phaneritic Felsic Igneous Rock)

Hardness: 6-7 Mohs; Color: Pink, reddish-orange, gray, and white; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: None (distinct mineral cleavage for feldspar components); Specific gravity: 2.63 to 2.75

Hardness: 6-7 Mohs
Color: Pink, reddish-orange, gray, and white
Luster: Vitreous to dull

Identified March 27, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). The pink color is due to the presence of potassium feldspar (orthoclase). These formations can range from billions of years old (Precambrian) to much younger, found in continental crust environments.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, and curbing. It is also used for monuments, gravestones, and as decorative aggregate in landscaping.

Geological facts

Granite makes up a large portion of the Earth's continental crust. The 'pink' variety is specifically high in K-feldspar. Mount Rushmore is carved into a granite batholith, and it is one of the hardest natural stones used in architecture.

Field identification & locations

Identify in the field by its interlocking coarse grains of salmon-pink feldspar, glassy gray quartz, and dark specks of mica or amphibole. It is found in mountain ranges and ancient shield areas like the Canadian Shield or the Llano Uplift in Texas.

Other igneous specimens

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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