Igneous

Pink Granite (Fragment)

Pink Granite (dominated by Potassium Feldspar: KAlSi3O8)

Hardness: 6-7 (Mohs). Color: Pink to reddish-orange with flecks of white. Luster: Vitreous to dull. Structure: Phaneritic (coarse-grained). Cleavage: Two directions at 90 degrees in feldspar components. Specific gravity: 2.63 - 2.75.

Hardness: 6-7 (Mohs)
Color: Pink to reddish-orange with flecks of white
Luster: Vitreous to dull

Identified March 8, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow cooling and crystallization of felsic magma deep beneath the Earth's surface (intrusive). The pink color indicates a high concentration of orthoclase feldspar. Geological ages vary widely from Archean to Cenozoic.

Uses & applications

Commonly used in construction for countertops, floor tiles, and grave markers. Small fragments are often used in crushed stone for landscaping or road base. Highly valued as architectural stone due to its durability and aesthetic appeal.

Geological facts

Granite makes up a large part of the continental crust. The pink 'variation' is primarily caused by potassium feldspar, and if the color is exceptionally red, it may be due to hematite impurities within the feldspar lattice.

Field identification & locations

Identify in the field by its speckled 'salt and pepper' appearance with distinct pinkish zones. It is harder than glass and will not react with acid. Commonly found in mountainous regions or glacial till in the Northern Hemisphere.

Other igneous specimens

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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