igneous

Feldspar-rich Granite (Pink Granite)

Phaneritic Felsic Igneous Rock

Hardness: 6-7 (Mohs scale); Color: Pink, orange, white, and translucent gray; Luster: Vitreous to pearly; Crystal structure: Coarse-grained phaneritic; Cleavage: Good in two directions (feldspar component)

Hardness: 6-7 (Mohs scale)
Color: Pink, orange, white, and translucent gray
Luster: Vitreous to pearly

Identified April 9, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground, allowing large crystals of orthoclase feldspar, quartz, and mica to grow. This typically occurs in continental crust during mountain-building events.

Uses & applications

Extensively used as dimension stone for countertops, flooring, monuments, and as crushed stone for road construction and railroad ballast.

Geological facts

Granite makes up the majority of the Earth's continental crust. The pink color in this specimen is specifically due to an abundance of potassium feldspar (orthoclase).

Field identification & locations

Identify by the interlocking 'jigsaw' texture of visible crystals and the presence of pink/orange feldspar alongside clear/grayish quartz. Common in batholiths and mountain ranges.

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

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral