igneous

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Hardness: 6-7 Mohs; Color: Pink, red, white, and grey; Luster: Vitreous to dull; Structure: Granular (phaneritic); Cleavage: Perfect in feldspar grains; Specific gravity: 2.63-2.75

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

Identified February 5, 2026More igneous →

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Physical properties

Hardness: 6-7 Mohs; Color: Pink, red, white, and grey; Luster: Vitreous to dull; Structure: Granular (phaneritic); Cleavage: Perfect in feldspar grains; Specific gravity: 2.63-2.75

Formation & geological history

Formed through the slow crystallization of magma below the Earth's surface (plutonic). This specimen appears to be a water-worn river stone or cobble, likely of Precambrian or Paleozoic age.

Uses & applications

Used extensively in construction for countertops, floor tiles, paving stones, and monuments. Also popular as decorative gravel and for shoreline armoring (riprap).

Geological facts

Granite makes up a large portion of the continental crust. The pink color is specifically due to an abundance of potassium feldspar (orthoclase). It is one of the hardest natural stones used in architecture.

Field identification & locations

Identify by its interlocking crystalline texture and lack of layering. Found globally in mountainous regions and riverbeds. Look for the 'salt and pepper' look where pink/white grains are mixed with dark minerals like biotite or hornblende.

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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.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

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

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Magnetite

Magnetite (Fe3O4)

mineral