igneous

Red Granite

Felsic Intrusive Igneous Rock

Hardness: 6-7 on Mohs scale; Color: Reddish-pink, black, and grey phaneritic texture; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) crystalline; Cleavage: Two directions for feldspar at 90 degrees; Specific gravity: 2.63 to 2.75

Hardness: 6-7 on Mohs scale
Color: Reddish-pink, black, and grey phaneritic texture
Luster: Vitreous to dull

Identified May 31, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground. The red color suggests a high concentration of potassium feldspar (orthoclase). These formations can occur throughout geological history, often in continental continental crust or mountain roots.

Uses & applications

Primarily used in construction for countertops, monuments, floor tiles, and as a decorative stone in landscaping and internal architecture due to its durability and aesthetic appeal.

Geological facts

The red color comes from iron-rich orthoclase or impurities in the mineral matrix. Granite makes up much of the continuous continental crust and has been used in ancient monuments like the Egyptian pyramids.

Field identification & locations

Identify by its interlocking coarse grains of red/pink feldspar, white/clear quartz, and dark mica. Commonly found in batholiths and exposed shield areas like the Canadian Shield or the 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