igneous

Red Granite

Phaneritic Plutonic Felsic Rock (rich in Potassium Feldspar)

Hardness: 6-7 on Mohs scale; Color: Red to pinkish tones with black and translucent/white specks; Luster: Dull naturally, vitreous/glassy when polished; Crystal Structure: Phaneritic (coarse-grained coarse crystalline); Cleavage: Perfect in feldspar grains, irregular in quartz.

Hardness: 6-7 on Mohs scale
Color: Red to pinkish tones with black and translucent/white specks
Luster: Dull naturally, vitreous/glassy when polished

Identified March 25, 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 (intrusive). The red color comes from high concentrations of orthoclase feldspar. Geological ages vary widely, commonly found in Precambrian cratons and mountain belts.

Uses & applications

Extensively used in construction for countertops, monuments, and floor tiles due to its durability. Polished spheres like this are used as decorative home decor, metaphysical stones, or collector specimens.

Geological facts

Granite makes up the majority of the Earth's continental crust. The red variety is specifically prized for its aesthetic warmth; famous historical structures like the Red Pyramid of Egypt utilize reddish granite variations.

Field identification & locations

Identify in the field by its 'salt and pepper' texture where crystals are large enough to see with the naked eye. Look for the interlocking mosaic of red feldspar, clear quartz, and black hornblende or biotite. Found in massive outcrops globally.

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

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral