igneous

Granite (specifically Pink Granite)

Phaneritic Plutonic Rock (High Potassium Feldspar Granite)

Hardness: 6-7 on Mohs scale; Color: Mottled pink, white, and black; Luster: Vitreous to dull; Crystal Structure: Coarse-grained (phaneritic) consisting of orthoclase feldspar, quartz, and hornblende or biotite; Cleavage: None (fractures irregularly); Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled pink, white, and black
Luster: Vitreous to dull

Identified March 22, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground (intrusive). The large crystal sizes indicate a long cooling period. This specimen likely dates from the Precambrian to Cenozoic eras depending on the specific batholith source.

Uses & applications

Widely used in construction for countertops, floor tiles, and paving stones. Also used in monuments, curbing, and as crushed stone for road base. In collecting, it is a staple for petrology study.

Geological facts

Granite makes up the majority of the Earth's continental crust. The pink color is specifically caused by an abundance of Potassium Feldspar (Orthoclase). It is one of the hardest and most durable natural stones used by humans since ancient Egypt.

Field identification & locations

Identify in the field by its 'salt and pepper' or multicrystalline appearance where individual mineral grains are visible to the naked eye. Found globally in mountainous regions and continental shields. To identify, look for interlocking crystals and the absence of layering or fossils.

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