igneous

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Hardness: 6-7 (Mohs). Color: Pink/red (potassium feldspar), white/gray (plagioclase), translucent (quartz). Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained). Cleavage: Distinct in feldspars, none in quartz.

Hardness: 6-7 (Mohs)
Luster: Dull to vitreous

Identified May 23, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below the Earth's surface (intrusive). Most granites date from the Precambrian to the Cenozoic eras, typically forming in continental crust above subduction zones.

Uses & applications

Used widely in construction for countertops, floor tiles, paving stones, and memorial monuments due to its durability and aesthetic appeal.

Geological facts

Granite makes up a large portion of the Earth's continental crust. Mount Rushmore is carved into a granite batholith. It is one of the hardest and most resistant rocks used by humans.

Field identification & locations

Identify by its 'salt and pepper' appearance with visible interlocking crystals of varied colors. It is found in mountain ranges and ancient continental shields. Collectors look for unique large crystal formations or rare accessory minerals within the matrix.

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