igneous

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Hardness: 6-7 Mohs; Color: Pink, reddish, mottled with gray and black; Luster: Vitreous to dull (when weathered); Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63 - 2.75.

Hardness: 6-7 Mohs
Color: Pink, reddish, mottled with gray and black
Luster: Vitreous to dull (when weathered)

Identified February 16, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. The specimen shown is a water-rounded cobble, likely eroded from a continental shield and transported by glacial or fluvial processes. Age typically ranges from Proterozoic to Phanerozoic eras.

Uses & applications

Used extensively as dimensional stone in construction, countertops, monuments, and as crushed aggregate for roads. In landscaping, rounded cobbles are used for decorative drainage and garden features.

Geological facts

The pink color is caused by an abundance of potassium feldspar (orthoclase). Granite makes up the bulk of the Earth's continental crust. It is one of the hardest and most durable common rock types.

Field identification & locations

Identify in the field by its 'salt and pepper' or mottled texture and visible interlocking crystals of varied colors. Common in glacial till across North America and within mountain ranges. 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)

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Magnetite

Magnetite (Fe3O4)

mineral