igneous

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Hardness: 6-7 Mohs; Color: Mottled grey, white, pink, and black; Luster: Dull to vitreous; Crystal structure: Coarse-grained phaneritic; Cleavage: None (individual minerals have cleavage); Specific gravity: 2.65-2.75.

Hardness: 6-7 Mohs
Color: Mottled grey, white, pink, and black
Luster: Dull to vitreous

Identified March 25, 2026More igneous →

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Physical properties

Formation & geological history

Formed by the slow crystallization of silica-rich magma deep beneath the Earth's surface (plutonic). Found in continental crust around the world with ages ranging from billions of years to relatively young mountain ranges.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monumental architecture due to its durability and aesthetic appeal.

Geological facts

Granite is one of the hardest and most common rocks on the Earth's surface, making up a significant portion of the continental crust. Half Dome in Yosemite National Park is a famous granite monolith.

Field identification & locations

Identified by its 'salt and pepper' appearance and visible interlocking crystals of quartz and feldspar. Found globally in mountainous regions and shield areas. Collectors look for unique mineral inclusions or rare colors.

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