igneous

Granite

Granite (Felsic Plutonic Rock)

Hardness: 6-7 on Mohs scale. Color: Pinkish-orange, tan, and grey with black specks. Luster: Dull to vitreous. Structure: Phaneritic (coarse-grained) crystalline. Cleavage: Indistinct. Specific Gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Pinkish-orange, tan, and grey with black specks
Luster: Dull to vitreous

Identified April 9, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below the Earth's surface. This specimen appears weathered and stained with iron oxides. Found in continental crust formations globally.

Uses & applications

Used extensively in construction for countertops, floor tiles, paving stones, and monuments due to its durability.

Geological facts

Granite makes up a large portion of the Earth's continental crust. It is one of the hardest substances in the world, second only to diamonds and some other minerals.

Field identification & locations

Identify by the 'salt and pepper' appearance of interlocking crystals (quartz, feldspar, and mica). This common specimen has a reddish-brown iron patina from weathering. Very common in mountainous regions.

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