igneous

Red Granite

Felsic intrusive igneous rock (K-feldspar rich Granite)

Hardness: 6-7 Mohs; Color: Pinkish-red to deep red base with translucent quartz; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63-2.75

Hardness: 6-7 Mohs
Color: Pinkish-red to deep red base with translucent quartz
Luster: Vitreous to dull

Identified March 23, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow cooling of silica-rich magma deep within the Earth's crust (plutonic). The red color is caused by an abundance of potassium feldspar (orthoclase) and traces of hematite. Most deposits date from the Precambrian to Paleozoic eras.

Uses & applications

Extensively used as dimensional stone for construction, kitchen countertops, monument carving, and exterior cladding. Used as crushed aggregate for road beds and landscaping.

Geological facts

Famous red granites include the 'Aswan Granite' used in Ancient Egyptian obelisks and the 'Imperial Red' from India. It is one of the most durable natural building materials, resistant to weathering and acid rain.

Field identification & locations

Identify by its interlocking 'salt and pepper' crystalline texture; look for distinct pink/red blocky crystals of potassium feldspar alongside grey, glassy quartz. Found in continental volcanic arcs and mountain roots globally.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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)

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

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

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Magnetite

Magnetite (Fe3O4)

mineral