igneous

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Hardness: 6-7 Mohs; Color: Pink, reddish-orange, with black and white flecks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75

Hardness: 6-7 Mohs
Color: Pink, reddish-orange, with black and white flecks
Luster: Dull to vitreous

Identified April 6, 2026More igneous →

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Physical properties

Hardness: 6-7 Mohs; Color: Pink, reddish-orange, with black and white flecks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. The pink color comes from a high concentration of potassium feldspar (orthoclase). These are often billions of years old, typically found in continental crustal shields.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and aesthetic appeal. Also used as aggregate in infrastructure.

Geological facts

Granite makes up a large part of the Earth's continental crust. Famous landmarks like Mount Rushmore and the base of the Statue of Liberty are made of granite. The pink variation is particularly prized for architectural aesthetics.

Field identification & locations

Identify in the field by its 'salt and pepper' look combined with pink hues and visible interlocked crystals. It is found in mountain ranges and glacial deposits. It will not react with acid, unlike limestone.

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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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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral