igneous

Granite

Phaneritic Felsic Igneous Rock

Hardness: 6-7 (Mohs scale); Color: Typically pink, gray, or reddish due to potassium feldspar; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarsegrained/visible crystals); Cleavage: Distinctive feldspar cleavage planes.

Hardness: 6-7 (Mohs scale)
Color: Typically pink, gray, or reddish due to potassium feldspar
Luster: Dull to vitreous

Identified April 1, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface (intrusive). Composed primarily of quartz and feldspar with minor amounts of mica and amphiboles. It can range in age from the Precambrian to Cenozoic eras.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and aesthetic appeal.

Geological facts

Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and oldest rocks found on Earth, with some specimens dating back over 3 billion years.

Field identification & locations

Identify in the field by its 'salt and pepper' or mottled appearance and the presence of visible interlocking crystals. Common in mountain ranges and continental shields. Collectors look for unique color variations or large phenocrysts (porphyritic texture).

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