Igneous

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Hardness: 6-7 Mohs; Color: Mottled pink, white, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Perfect on feldspar grains, none on quartz grains; Specific gravity: 2.63 - 2.75

Hardness: 6-7 Mohs
Color: Mottled pink, white, gray, and black
Luster: Vitreous to dull

Identified March 22, 2026More igneous →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the slow cooling of silica-rich magma deep within the Earth's crust (intrusive). They are typically found in continental crustal plates and can range in age from billions of years (Precambrian) to relatively recent geological eras.

Uses & applications

Extensively used in construction as dimension stone, countertops, floor tiles, and outdoor monuments. It is also crushed for use in road base and rail ballast, and occasionally used for lapidary work.

Geological facts

Granite makes up a large portion of the Earth's continental crust. The pink color specifically comes from an abundance of potassium feldspar (orthoclase). Mount Rushmore is carved into a massive granite batholith.

Field identification & locations

Identify in the field by its 'salt and pepper' look with pink hues and visible interlocking crystals. It is ubiquitous in mountainous regions and glacial till. Collectors look for unique mineral inclusions or large phenocrysts (porphyritic texture).

Other igneous specimens

See all

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