igneous

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Hardness: 6-7 Mohs; Color: Pinkish-red, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) equigranular; Cleavage: None (though feldspars show cleavage); Specific gravity: 2.63-2.75

Hardness: 6-7 Mohs
Color: Pinkish-red, white, and grey
Luster: Vitreous to dull

Identified May 28, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface (plutonic). This specific specimen appears to be a rounded river stone or glacial erratic, likely originating from a Precambrian or Paleozoic formation.

Uses & applications

Used extensively in construction for countertops, floor tiles, paving stone, curbing, and as a dimension stone for monuments and memorials.

Geological facts

Granite makes up a large portion of the Earth's continental crust. The pink/red color in this specific specimen is due to a high concentration of potassium feldspar (orthoclase).

Field identification & locations

Identify in the field by its visible interlocking crystals of different colors (salt and pepper appearance with pink hues). It is extremely common in mountainous regions or areas with exposed continental shields like the Canadian Shield.

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

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

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