igneous

Granite

Phaneritic plutonic rock (SiO2 + Al2O3)

Hardness: 6-7 (Mohs scale); Color: Pinkish-tan with black and white mottling; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained crystals); Cleavage: Distinct in feldspar minerals; Specific Gravity: 2.63 to 2.75.

Hardness: 6-7 (Mohs scale)
Color: Pinkish-tan with black and white mottling
Luster: Vitreous to dull

Identified May 24, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of silica-rich magma below Earth's surface. This specimen likely belongs to a continental pluton formed millions of years ago, often exposed by crustal uplift and erosion.

Uses & applications

Extensively used in construction, architectural facades, countertops, monuments, and as crushed stone for road base.

Geological facts

Granite is the most common igneous rock found on Earth's continents. It contains quartz, which is one of the hardest common minerals, making granite incredibly durable.

Field identification & locations

Identify by its interlocking 'salt and pepper' appearance of quartz (clear/gray), feldspar (pink/white), and biotite or hornblende (black). It is commonly found in mountainous regions or glacial till.

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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