igneous

Red Granite

Felsic Intrusive Igneous Rock

Hardness: 6-7 (Mohs); Color: Pink to reddish-brown with grey/black specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspar grains; SG: 2.63-2.75

Hardness: 6-7 (Mohs)
Color: Pink to reddish-brown with grey/black specks
Luster: Vitreous to dull

Identified May 16, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow subterranean cooling of silica-rich magma over millions of years, typically within the Earth's continental crust during orogenic (mountain-building) events.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, monuments, and as crushed stone for road base and railroad ballast.

Geological facts

Red granite gets its distinctive color from a high concentration of potassium feldspar (orthoclase). It is one of the oldest and most durable rocks on the planet, often making up the core of mountain ranges.

Field identification & locations

Identify in the field by its interlocking coarse grains and lack of layering. Commonly found in continental shields such as the Canadian Shield or the Llano Uplift in Texas.

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