Granite

Hardness (Mohs scale): 6-7; Color: Typically light-colored, ranging from white, pink, or gray, often with darker mineral grains such as black biotite or hornblende; Luster: Vitreous to subvitreous; Crystal structure: Phaneritic (coarse-grained) with interlocking crystals; Cleavage: Generally poor, breaks unevenly. Specific Gravity: 2.6-2.7

Granite is an intrusive igneous rock, meaning it formed from the slow crystallization of magma below Earth's surface. It primarily forms from felsic magma (rich in silica, alkali feldspar, and quartz). The slow cooling allows for the formation of large, visible mineral crystals. It is commonly found in continental crust and is often associated with ancient mountain-building events (orogenies). Geological age varies widely, from Precambrian to Cenozoic.

Widely used in construction for countertops, flooring, paving, and building facades due to its durability, aesthetic appeal, and resistance to weathering. Also used for monuments, sculptures, and in landscaping. Its resistance to erosion makes it a stable material.

Granite is one of the most common igneous rocks on Earth. Many famous historical structures and monuments around the world are made of granite, such as Mount Rushmore and parts of the Pyramids of Giza. Its name comes from the Latin 'granum', referring to its coarse-grained structure. It is a key component of the continental crust.

In the field, granite can be identified by its coarse-grained texture, light color, and the presence of visible interlocking crystals of quartz (glassy, gray), feldspar (white, pink, or gray opaque), and darker minerals like biotite (black, flaky) or hornblende (black, elongated). It is commonly found in mountainous regions, exposed in batholiths and laccoliths, and in areas that were once tectonically active. For collectors, granite is common and valued for its aesthetic variations; polished samples highlight its beauty. Look for fresh, unweathered surfaces to appreciate its true color and texture. Collectors might seek unique patterns or rare mineral inclusions.