igneous

Granite

Felsic Plutonic Rock (Granite)

Hardness: 6-7 on Mohs scale; Color: Pink, white, cream with grey/black specks; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Composition: Quartz, Potassium Feldspar (Orthoclase), and Mica.

Hardness: 6-7 on Mohs scale
Color: Pink, white, cream with grey/black specks
Luster: Vitreous to dull

Identified May 30, 2026More igneous →

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Physical properties

Formation & geological history

Formed by the slow crystallization of magma below Earth's surface. This specimen shows a high concentration of pink orthoclase feldspar. Common in continental crust and mountain ranges from all geological periods.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stone, monuments, and as a decorative building stone due to its durability.

Geological facts

Granite is one of the hardest substances in the world. It is the most common igneous rock found on Earth's continents and makes up the core of many mountain chains.

Field identification & locations

Identify by its visible interlocking crystals of different colors (usually pink, white, and black). It will not be scratched by a steel knife. Found in outcrops, rivers in mountainous regions, or as glacial erratics.

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