igneous

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Hardness: 6-7 on Mohs scale; Color: Salt and pepper (pink, white, gray, and black); Luster: Vitreous to dull; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75

Hardness: 6-7 on Mohs scale
Color: Salt and pepper (pink, white, gray, and black)
Luster: Vitreous to dull

Identified May 16, 2026More igneous →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Salt and pepper (pink, white, gray, and black); Luster: Vitreous to dull; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface. This specimen appears to be water-worn, likely found in a riverbed or glacial deposit. Typical age ranges from millions to billions of years old depending on the location of the pluton.

Uses & applications

Used extensively in construction for countertops, floor tiles, paving stones, and monuments. Also crushed for use as aggregate in road building and concrete.

Geological facts

Granite is the most common igneous rock found in Earth's continental crust. El Capitan in Yosemite National Park is a famous massive granite monolith.

Field identification & locations

Identify by its visible interlocking crystals of different colors. It is commonly found in mountainous regions or glacial till. For collectors, look for high quartz content or unique pink orthoclase crystals.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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)

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Magnetite

Magnetite (Fe3O4)

mineral