igneous

Granite (specifically Pink or Red Granite)

Phaneritic Felsic Igneous Rock (Granite)

Hardness: 6-7 on Mohs scale. Color: Mottled pink, red, grey, and black. Luster: Vitreous to dull. Crystal Structure: Phaneritic (coarse-grained) with visible crystals of quartz, feldspar, and mica. Specific Gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled pink, red, grey, and black
Luster: Vitreous to dull

Identified March 26, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface (intrusive). Geological age varies from Precambrian to Cenozoic depending on the pluton. It typically forms in continental crust above subduction zones.

Uses & applications

Widely used in construction for countertops, floor tiles, paving stones, curbing, and monuments. Also used as crushed stone for road base and railroad ballast. Well-polished specimens are used in decorative sculpture.

Geological facts

Granite makes up a large portion of the Earth's continental crust. El Capitan in Yosemite National Park is one of the world's most famous exposed granite monoliths. The red color in this specimen is primarily due to the presence of potassium feldspar (orthoclase).

Field identification & locations

Identify in the field by its 'salt and pepper' or mottled appearance and coarse grains that are interlocking. It is found in large mountain ranges and continental shields. Collectors look for large, well-formed crystals of the constituent minerals like smoky quartz or biotite.

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