igneous

Granite (Pink/Red Orthoclase variety)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Hardness: 6-7 on Mohs scale. Color: Mottled pink, white, gray, and black. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Cleavage: Perfect in two directions in the feldspar minerals.

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

Identified March 22, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. It is a coarse-grained intrusive rock. Age varies by location but typically forms in continental crust during orogenic events.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stone, and curbing. It is also used as crushed stone for road base and as a dimension stone for monuments.

Geological facts

Granite makes up the bulk of Earth's continental crust. The pink hue in this specimen is caused by the high concentration of potassium-rich orthoclase feldspar.

Field identification & locations

Identify by its interlocking 'mosaic' of minerals where crystals are visible to the naked eye. Found in continental mountain ranges and shield areas. Collectors value it for lapidary work if it contains large, clear crystals.

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