igneous

Pink Granite

Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)

Hardness: 6-7 on Mohs scale; Color: Pink, reddish-orange with speckles of grey and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Perfect in two directions for the feldspar component.

Hardness: 6-7 on Mohs scale
Color: Pink, reddish-orange with speckles of grey and black
Luster: Dull to vitreous

Identified April 3, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground (plutonic). The pink hue comes from an abundance of potassium feldspar (orthoclase). Found in continental crust ranging from Precambrian to Cenozoic ages.

Uses & applications

Extensively used in construction for countertops, floor tiles, monuments, and as crushed stone for road base. Higher quality specimens are polished for architectural decorative stone.

Geological facts

Pink granite is the state rock of New Hampshire and is famous for forming large batholiths like the Enchanted Rock in Texas. Its durability makes it one of the oldest building materials used by humans, including in Egyptian pyramids.

Field identification & locations

Identify in the field by the salt-and-pepper texture with a dominant pink/salmon background and the inability to be scratched by a steel knife. Commonly found in mountainous regions or glacial deposits.

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