Rock Identifier
Granite (Granite) — Igneous
Igneous

Granite

Granite

Hardness: 6-7 (Mohs scale), Color: Varies widely depending on mineral composition, often pink, white, gray, or black, Luster: Vitreous (glassy), Crystal structure: Interlocking coarse grains, predominantly quartz, feldspar, and mica, Cleavage: Minerals have variable cleavage, but the rock itself does not, Specific grav…

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Varies widely depending on mineral composition, often pink, white, gray, or black, Luster: Vitreous (glassy), Crystal structure: Interlocking coarse grains, predominantly quartz, feldspar, and mica, Cleavage: Minerals have variable cleavage, but the rock itself does not, Specific gravity: 2.6-2.8

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface. Intrusion of magma cools slowly, allowing large crystals to form.

Uses & applications

Extensively used in construction, monuments, interior countertops, and flooring due to its durability and aesthetic appeal.

Geological facts

Granite is a major component of Earth's continental crust. Mount Rushmore is carved into a massive granite outcrop.

Field identification & locations

Identifiable by its coarse-grained texture and typical mineral composition (quartz, feldspar, mica). Found globally in continental shields and mountain ranges.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral
Dalmatian Jasper (Aplite with Arfvedsonite inclusions) — igneous

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

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Magnetite (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite

Iron(II,III) oxide (Fe3O4)

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

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