Rock Identifier

igneous

Granite (Phaneritic Igneous Rock)

Granite

Hardness: 6-7 on Mohs scale; Color: Grey with speckled white and dark minerals; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75.

Hardness: 6-7 on Mohs scale
Color: Grey with speckled white and dark minerals
Luster: Vitreous to dull

Identified April 11, 2026More igneous →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 on Mohs scale; Color: Grey with speckled white and dark minerals; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75.

Formation & geological history

Formed from the slow cooling and crystallization of magma beneath the Earth's surface (intrusive). This specific specimen appears water-worn, suggesting a river or glacial transport history.

Uses & applications

Construction (countertops, flooring, monuments), landscaping, and industrial abrasives. In this rounded form, it is often used for decorative landscaping or river rock features.

Geological facts

Granite makes up a large part of the continental crust. It is one of the hardest and most durable common stones, which is why it has been used in architecture since Ancient Egyptian times.

Field identification & locations

Identify by its interlocking 'mosaic' of different colored minerals (quartz, feldspar, and mica/amphibole). It is found globally in mountainous regions and shield areas.

More like this

Other igneous specimens

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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.

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

Magnetite

Iron(II,III) oxide (Fe3O4)

Sodalite (Sodalite - Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Blue Apatite (Apatite (Group), Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

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

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)