igneous

Granite (specifically Pink or Alkali Feldspar Granite)

Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)

Hardness: 6-7 (Mohs scale); Color: Pink to reddish-orange from potassium feldspar, white/grey from quartz; Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained) macro-crystalline; Cleavage: Two directions at 90 degrees in feldspar components, none in quartz; Specific gravity: 2.63 to 2.75

Hardness: 6-7 (Mohs scale)
Luster: Vitreous to pearly

Identified March 8, 2026More igneous →

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Physical properties

Formation & geological history

Formed by the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). Geological age varies from Precambrian to Cenozoic depending on the specific batholith, but often found in ancient continental crust.

Uses & applications

Widely used as dimension stone for countertops, floor tiles, and monuments. Also used as crushed stone in construction, road base, and as decorative landscaping rock.

Geological facts

Granite makes up the majority of the Earth's continental crust. The pink color specifically comes from an abundance of potassium feldspar (orthoclase), and the variety seen in the image contains distinct veins or pockets of milky quartz.

Field identification & locations

Identify in the field by its blocky texture, hard surface that cannot be scratched by a steel knife, and a 'salt and pepper' or multicomponent mineral look. Found globally in mountainous regions and shield areas like the Rockies, Appalachians, or Scottish Highlands.

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