igneous

Pink Granite (with Potassic Feldspar and Quartz)

Felsic Intrusive Igneous Rock (Granite)

Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey; Luster: Vitreous to pearly; Crystal Structure: Phaneritic (visible interlocking crystals); Cleavage: Perfect on feldspar grains, none on quartz; Specific Gravity: 2.63 to 2.75

Hardness: 6-7 on Mohs scale
Color: Pink, white, and grey
Luster: Vitreous to pearly

Identified February 24, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. This intrusive process allows large crystals to form. Specimens can range from Precambrian to Cenozoic in age, commonly found in continental crustal batholiths.

Uses & applications

Used extensively in construction (countertops, tiles, paving), monuments, and as crushed stone for road base. Pure pieces are also collected as mineral samples.

Geological facts

Granite makes up the majority of the Earth's continental crust. Mount Rushmore is carved into a massive granite batholith. The pink color specifically comes from an abundance of potassium feldspar (orthoclase).

Field identification & locations

Identify in the field by its 'salt and pepper' or speckled appearance with visible crystals that are interlocked rather than cemented. Commonly found in mountainous regions or glacial till. Collectors should look for large, well-defined feldspar phenocrysts.

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