igneous

Granite (Pink/Potassium-rich)

Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Hardness: 6 to 7 (Mohs scale); Color: Mottled pink, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) crystalline; Cleavage: None (grains exhibit fracture); Specific Gravity: 2.63 to 2.75

Hardness: 6 to 7 (Mohs scale)
Color: Mottled pink, white, and grey
Luster: Vitreous to dull

Identified March 29, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). This specimen likely dates from the Precambrian or Paleozoic eras depending on the exact source region, formed in continental crustal environments.

Uses & applications

Used extensively in construction (countertops, flooring, monuments), as crushed stone for road base, and by hobbyists for lapidary work (tumbling and polishing).

Geological facts

Granite is the primary component of the Earth's continental crust. The pink hue in this specific specimen is caused by a high concentration of Potassium Feldspar (Orthoclase). It is one of the hardest and most durable common rocks on the planet.

Field identification & locations

Identify in the field by its 'salt and pepper' or mottled appearance with visible interlocking crystals of quartz (clear/grey) and feldspar (pink/white). It is commonly found in mountain ranges and glacial deposits. It will not react with acid, unlike limestone.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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