igneous

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Hardness: 6-7 on Mohs scale; Color: typically white, gray, or pink with dark speckles; Luster: dull to vitreous; Crystal structure: phaneritic (coarse-grained, visible crystals); Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: typically white, gray, or pink with dark speckles
Luster: dull to vitreous

Identified March 16, 2026More igneous →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed through the slow crystallization of magma below the Earth's surface (intrusive). Geological age varies from billions of years (Precambrian) to more recent eras depending on the specific batholith.

Uses & applications

Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and aesthetic appeal.

Geological facts

Granite makes up a large portion of the Earth's continental crust. Famous landmarks like Mount Rushmore and the Egyptian Pyramids contain or are made of various types of granite and related stones.

Field identification & locations

Identify by its 'salt and pepper' appearance and visible interlocking crystals. It is found in mountain ranges and eroded continental shields worldwide. 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