igneous

Granite

Granite (Phaneritic intrusive igneous rock)

Hardness (Mohs scale): 6-7. Color: Pink, white, gray, and black speckles. Luster: Vitreous to dull. Crystal structure: Phaneritic (large, visible crystals). Composition: Quartz, Potassium Feldspar (pink), and Plagioclase, with Biotite mica.

Color: Pink, white, gray, and black speckles
Luster: Vitreous to dull

Identified June 4, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface (intrusive). The pink color indicates a high concentration of potassium feldspar. It can be found in continental crust across all geological ages.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and resistance to weathering.

Geological facts

Granite is the most common rock found in the Earth's continental crust. It is the rock that makes up famous landmarks like Yosemite's Half Dome and Mount Rushmore.

Field identification & locations

Identify by its interlocking 'salt and pepper' or multicrystalline appearance with no layering. It is found in mountain ranges and shields. Collectors look for unique color variations or large crystal sizes (pegmatites).

Other igneous specimens

See all

Granite

Igneous

Granite

Igneous

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

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