igneous

Granite

Granite (silica-rich intrusive igneous rock)

Hardness: 6-7 on Mohs scale. Color: Mottled grey, white, and black with hints of tan. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Cleavage: Varies by mineral constituent (Feldspar has good cleavage, Quartz has none). Specific gravity: 2.63-2.75.

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

Identified May 21, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface. Common in continental crust and often dates back to various tectonic periods, from the Precambrian to more recent orogenies.

Uses & applications

Widely used in construction for countertops, floor tiles, paving stones, and monuments. Also used by hobbyists for tumbling and as aggregate.

Geological facts

Granite is the primary component of the continental crust. It is one of the hardest and most durable natural stones, making it the preferred choice for long-lasting monuments and high-traffic flooring.

Field identification & locations

Identify by its interlocking crystalline texture and presence of quartz and feldspar. Commonly found in mountainous regions or as river-worn pebbles. Collectors look for unique mineral inclusions or colors.

Other igneous specimens

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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