igneous

Granite (White Granite variant)

Phaneritic Plutonic Rock (High-silica Felsic)

Hardness: 6-7 on Mohs scale. Color: White, grey, black, and sometimes pink. Luster: Vitreous to pearly. Crystal structure: Phaneritic (coarse-grained). Cleavage: Perfect in feldspar components. Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: White, grey, black, and sometimes pink
Luster: Vitreous to pearly

Identified March 28, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface (intrusive). Geological age varies from Pre-Cambrian to Cenozoic depending on the specific batholith. Found in continental crust mountain belts.

Uses & applications

Major use in construction (curbstones, floor tiles), kitchen countertops, dimension stone for monuments, and aggregate for road base.

Geological facts

Granite is one of the hardest and most durable substances on Earth, which is why it has been used since Ancient Egypt for building pyramids and statues. It makes up a significant portion of the Earth's continental crust.

Field identification & locations

Identify by its interlocking 'salt and pepper' crystalline texture and extreme hardness (cannot be scratched by a steel knife). Commonly found in the Sierra Nevada mountains, Brazil, India, and China. Collectors look for unique mineral inclusions like tourmaline or garnet.

Other igneous specimens

See all

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