igneous

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Hardness: 6-7 on Mohs scale; Color: Multi-colored with tan, grey, and white grains; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Composition: Principally quartz, feldspar, and mica.

Hardness: 6-7 on Mohs scale
Color: Multi-colored with tan, grey, and white grains
Luster: Dull to vitreous

Identified June 1, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface. This specific specimen has been rounded by fluvial processes (water erosion) in a river or stream environment.

Uses & applications

Used in landscaping, construction aggregate, and gravel. Larger blocks are used for countertops and monuments.

Geological facts

Granite makes up a large part of the Earth's continental crust. It is one of the hardest and most durable common stones.

Field identification & locations

Identify by its 'salt and pepper' look or multi-colored speckled appearance and extreme hardness. Commonly found in riverbeds, glacial tills, and mountainous regions.

Other igneous specimens

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Granite

Igneous

Granite

Igneous

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

igneous

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