igneous

Granite

Phaneritic Felsic Igneous Rock

Hardness: 6-7 on Mohs scale. Color: Spotted pink, gray, and white. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible interlocking crystals of quartz, feldspar, and mica). Specific gravity: 2.63-2.75.

Hardness: 6-7 on Mohs scale
Color: Spotted pink, gray, and white
Luster: Dull to vitreous

Identified May 22, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling and crystallization of magma deep beneath the Earth's surface (plutonic). Found in continental crust, often forming the cores of mountain ranges.

Uses & applications

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

Geological facts

Granite is one of the hardest substances in the world. It is so resistant to weathering that it forms famous landmarks like Yosemite's Half Dome and Mount Rushmore.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals. It is ubiquitous in mountainous or glaciated regions worldwide.

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