igneous

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Hardness: 6-7 (Mohs scale); Color: Pink, gray, white, and black mottled pattern; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Perfect in feldspar minerals; Specific Gravity: 2.63 - 2.75.

Hardness: 6-7 (Mohs scale)
Color: Pink, gray, white, and black mottled pattern
Luster: Dull to vitreous

Identified March 31, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface (plutonic). The pink color is specifically due to a high abundance of potassium feldspar (orthoclase). These can date back billions of years, often forming the cores of continents.

Uses & applications

Used extensively in construction for countertops, floor tiles, and paving stones. Also used for monuments, gravestones, and as decorative aggregate in landscaping.

Geological facts

Granite is the most common igneous rock found at Earth's surface and makes up a large portion of the continental crust. Mount Rushmore is carved into a granite batholith.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance with pinkish hues and visible mineral grains that are interlocked. Commonly found in mountainous regions or glacially transported as river rocks.

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

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral