igneous

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 + SiO2 + NaAlSi3O8)

Hardness: 6-7 on Mohs scale. Color: Pinkish-white with black specks. Luster: Vitreous to pearly. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Pinkish-white with black specks
Luster: Vitreous to pearly

Identified May 3, 2026More igneous →

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Physical properties

Hardness: 6-7 on Mohs scale. Color: Pinkish-white with black specks. Luster: Vitreous to pearly. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 to 2.75.

Formation & geological history

Formed by the slow crystallization of magma below Earth's surface. Primarily found in continental crust; ages vary from Precambrian to Cenozoic depending on the location of the batholith.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, monuments, and as a dimension stone for buildings.

Geological facts

Granite makes up a large part of the Earth's continental crust; the famous 'Half Dome' in Yosemite National Park is a massive granite monolith.

Field identification & locations

Identify in the field by its visible interlocking crystals of quartz (clear/grey), feldspar (pink/white), and mica (black/shiny). Found in mountain ranges and eroded shield areas.

Other igneous specimens

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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