igneous

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Hardness: 6-7 (Mohs scale); Color: Mottled orange, brown, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75

Hardness: 6-7 (Mohs scale)
Color: Mottled orange, brown, gray, and black
Luster: Vitreous to dull

Identified May 6, 2026More igneous →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Mottled orange, brown, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. This specific countertop variety likely dates back hundreds of millions of years and formed in a plutonic environment.

Uses & applications

Used extensively in construction for countertops, floor tiles, paving stone, curbing, and monuments due to its durability and aesthetic appeal.

Geological facts

Granite is the most common igneous rock found at Earth's surface and makes up a significant portion of the continental crust. The name comes from the Latin 'granum', meaning a grain.

Field identification & locations

Identify by its interlocking granular texture of light and dark minerals. Common in mountain ranges and shield areas globally. Collectors often look for unique pegmatite or porphyritic variations.

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

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral