igneous

Granite

Hardness: 6-7 on Mohs scale; Color: Pink, gray, white, or red with dark mineral grains. Luster: Dull to pearly. Crystal structure: Phaneritic (coarse-grained). Cleavage: Generally none, but individual minerals like mica or feldspar within it have cleavage. Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Pink, gray, white, or red with dark mineral grains
Luster: Dull to pearly

Identified May 10, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface. Mainly composed of quartz and feldspar with minor amounts of mica and amphiboles. Often found in continental crust and mountain ranges.

Uses & applications

Widely used in construction for countertops, floor tiles, paving stones, monuments, and curbing due to its durability.

Geological facts

Granite is one of the hardest substances in the world. The word comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.

Field identification & locations

Identify by its interlocking crystalline texture containing both light (quartz/feldspar) and dark (biotite/hornblende) minerals. Common in glacial till or riverbeds in continental regions.

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