igneous

Pink Granite (Alkali Feldspar Granite)

Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)

Hardness: 6-7 Mohs scale; Color: Pink, reddish-orange with speckled white/grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in two directions for feldspar components; Specific gravity: 2.63 to 2.75.

Hardness: 6-7 Mohs scale
Color: Pink, reddish-orange with speckled white/grey
Luster: Vitreous to dull

Identified March 25, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface (intrusive). Geological age varies globally but frequently associated with Precambrian or Paleozoic tectonic events. The pink color comes from a high concentration of potassium feldspar (orthoclase).

Uses & applications

Used extensively in construction for countertops, floor tiles, and paving stones. Also used in monuments, curbing, and as crushed aggregate for road foundations.

Geological facts

Granite makes up a large portion of the Earth's continental crust. Famous specimens include the monoliths of Yosemite National Park (like El Capitan) and the pink granite of the Aswan quarries used by Ancient Egyptians for obelisks.

Field identification & locations

Identify in the field by its 'salt and pepper' or speckled texture with visible interlocking crystals. It will not react with acid (unlike limestone) and is hard enough to scratch glass. Found globally in mountainous regions and continental shields like the Canadian Shield.

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