igneous

Granite

Intrusive igneous felsic rock

Hardness (Mohs): 6-7; Color: Pink, white, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75

Color: Pink, white, gray, and black
Luster: Vitreous to dull

Identified May 16, 2026More igneous →

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Physical properties

Hardness (Mohs): 6-7; Color: Pink, white, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75

Formation & geological history

Formed through the slow crystallization of magma below the Earth's surface (plutonic). It is primarily found in the continental crust and can date back to billions of years (Archean Eon) to more recent periods.

Uses & applications

Widely used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as crushed stone for road base.

Geological facts

Granite is the most common igneous rock found at the Earth's surface and makes up a large part of the continental crust. The Yosemite Valley in California features massive granite monoliths.

Field identification & locations

Identify by its interlocking 'salt and pepper' appearance of quartz, feldspar, and mica. It is ubiquitous in mountainous regions and continental shields. Collectors look for unique mineral inclusions or rare colors.

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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