igneous

Pink Granite

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

Hardness: 6-7 Mohs; Color: Pink, salmon, or reddish with flecks of grey and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in two directions for feldspar components.

Hardness: 6-7 Mohs
Color: Pink, salmon, or reddish with flecks of grey and black
Luster: Vitreous to dull

Identified April 1, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface. The pink color is derived from an abundance of potassium feldspar (orthoclase). These are typically found in batholiths and continental crust that can be billions of years old.

Uses & applications

Used extensively in construction for countertops, floor tiles, and monuments. It is also crushed for road base and used by collectors as a representative specimen of intrusive igneous activity.

Geological facts

Granite is the most common igneous rock found on the Earth's continents. The pink hue specifically points to a higher concentration of alkali feldspar rather than plagioclase feldspar.

Field identification & locations

Identify in the field by its large, visible crystals (phaneritic texture) and the presence of quartz mixed with pink orthoclase. Commonly found in mountainous regions or shield areas like the Llano Uplift in Texas or the Scottish Highlands.

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