igneous

Granite

Phaneritic Felsic Igneous Rock (Granite)

Hardness: 6-7 on Mohs scale. Color: Mottled gray, white, and black with slight yellowish patches. Luster: Dull to Vitreous (shiny on crystal faces). Structure: Phaneritic (coarse-grained) crystalline. Composition: Primarily quartz, feldspar, and mica.

Hardness: 6-7 on Mohs scale
Color: Mottled gray, white, and black with slight yellowish patches
Luster: Dull to Vitreous (shiny on crystal faces)

Identified April 7, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface (intrusive). Geological age varies from Precambrian to Cenozoic depending on the tectonic setting of the pluton.

Uses & applications

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

Geological facts

Granite makes up a massive portion of the Earth's continental crust. It is one of the hardest substances in the world, second only to diamonds among common minerals/rocks.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance and visible, interlocking crystals of quartz (clear/gray) and feldspar (white/pink). Found in mountainous regions and areas where ancient roots of mountains have been exposed.

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