igneous

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (white/gray with black specks). Luster: Dull to vitreous. Crystal structure: Phaneritic (visible crystals). Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Salt-and-pepper (white/gray with black specks)
Luster: Dull to vitreous

Identified March 23, 2026More igneous →

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Physical properties

Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (white/gray with black specks). Luster: Dull to vitreous. Crystal structure: Phaneritic (visible crystals). Specific gravity: 2.63 to 2.75.

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. Found in continental crust, often appearing in mountain ranges after millions of years of erosion and uplift.

Uses & applications

Extensively used in construction, countertops, monuments, paving stones, and as crushed stone for road base.

Geological facts

Granite is the most common igneous rock found on the Earth's surface. Mount Rushmore is carved into a massive granite batholith in South Dakota.

Field identification & locations

Identify by its interlocking granular texture where individual minerals like translucent quartz and opaque feldspar are clearly visible to the naked eye. Found worldwide in continental shields and orogenic belts.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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)

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

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

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Magnetite

Magnetite (Fe3O4)

mineral