igneous

Granite Pebble

Felsic intrusive igneous rock (consisting primarily of Quartz and Feldspar)

Hardness: 6-7 on Mohs scale. Color: Mottled pink, white, and grey with black specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, though polished here). Cleavage: None (fractures irregularly). Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled pink, white, and grey with black specks
Luster: Vitreous to dull

Identified May 30, 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 from the slow crystallization of magma below Earth's surface. This specific specimen has been water-worn and smoothed in a river or beach environment. Likely formed during various Orogenic events throughout Earth's history.

Uses & applications

Used widely in construction (countertops, flooring), monuments, and as decorative landscaping stones or aggregate.

Geological facts

Granite makes up a large portion of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous granite monoliths in the world.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance and hardness (cannot be scratched by a steel knife). Commonly found in mountain ranges and glacial deposits.

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

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral