igneous

Granite

Granite (comprised primarily of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica (KAl2(AlSi3O10)(OH)2))

Hardness: 6-7 Mohs; Color: Salt and pepper appearance with white/grey quartz and pink/cream feldspar; Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75

Hardness: 6-7 Mohs
Luster: Vitreous to pearly

Identified February 25, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below the Earth's surface (plutonic). Found in continental crust within mountain ranges and batholiths, often dating back hundreds of millions to billions of years.

Uses & applications

Dominantly used in construction for countertops, floor tiles, paving stones, curbing, and monuments. Highly valued for its durability and aesthetic appeal.

Geological facts

Granite makes up a large portion of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous massive granite monoliths in the world.

Field identification & locations

Identify in the field by its visible, interlocking crystals of quartz and feldspar. Found globally in mountainous regions. Collectors look for unique phenocrysts (large crystals) or unusual mineral inclusions.

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

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral