igneous

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Hardness: 6-7 Mohs; Color: Pink, orange, red with grey/white and black specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (large, visible grains); Cleavage: Perfect on feldspar grains; Specific gravity: 2.63-2.75

Hardness: 6-7 Mohs
Color: Pink, orange, red with grey/white and black specks
Luster: Vitreous to dull

Identified May 26, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling and crystallization of magma deep underground (intrusive). Predominantly composed of orthoclase feldspar, quartz, and mica/amphibole. Found in continental crust across all geological ages, often in batholiths.

Uses & applications

Extensively used in construction for countertops, flooring, monuments, and curbing. Used as crushed stone for road base and aggregate. Highly valued as an ornamental stone in architecture.

Geological facts

The pink color is specifically due to a high concentration of potassium-rich orthoclase feldspar. Mount Rushmore is carved into a granite batholith. It is one of the oldest and most abundant rocks on Earth's continental crust.

Field identification & locations

Identify by its interlocking 'salt and pepper' crystalline texture and pinkish orthoclase content. Found in mountainous or shield regions like the Scottish Highlands, the Rockies, or the Canadian Shield. Unlike sandstone, it won't crumble between fingers.

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

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral