igneous

Granite

Phaneritic Felsic Igneous Rock

Hardness: 6-7 on Mohs scale; Color: Pink, white, gray, and black speckles; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained crystals); Cleavage: Varies by mineral constituent; Specific Gravity: 2.63-2.75

Hardness: 6-7 on Mohs scale
Color: Pink, white, gray, and black speckles
Luster: Vitreous to dull

Identified February 3, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of silica-rich magma below the Earth's surface (intrusive). Most continental granite formed during the Precambrian or Paleozoic eras within the Earth's crust.

Uses & applications

Widely used in construction for countertops, floor tiles, paving stones, curbing, and 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 massive granite batholith in South Dakota, USA.

Field identification & locations

Identify by its 'salt and pepper' appearance with visible crystals of quartz (clear/gray), feldspar (pink/white), and mica (black). Commonly found in mountain ranges and continental shields. Collectors look for unique mineral inclusions or rare colors.

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