Introduction
Granite is a coarse-grained igneous rock composed primarily of quartz (20-60%), feldspar (35-65%), and mica (1-15%), with trace amounts of amphibole and other minerals. Formed deep underground through the slow crystallization of magma, granite is one of the hardest and most durable natural stones available for construction and interior design. Its name derives from the Latin "granum," meaning grain, referring to its visibly granular texture.
Physical and Mechanical Properties
Granite ranks between 6 and 7 on the Mohs hardness scale, making it harder than steel (which registers around 5.5) and significantly harder than marble (3-5). This hardness translates directly to scratch resistance in kitchen applications - a steel knife dragged across a granite countertop will not leave a mark. The density of granite ranges from 2.65 to 2.75 g/cm3, and its compressive strength typically falls between 100 and 250 MPa. Flexural strength ranges from 8 to 20 MPa. The stone's water absorption rate is remarkably low, typically between 0.1% and 0.4%, giving it natural resistance to moisture and staining when properly sealed.
Granite's melting point exceeds 1215 degrees Celsius, and its thermal expansion coefficient is approximately 7 to 9 x 10^-6 per degree Celsius. These thermal properties make granite ideal for use around cooking appliances, and hot pots and pans can be placed directly on a granite surface without causing damage.
Global Quarry Sources
Brazil - Brazil is the world's largest exporter of granite, producing over 400 commercial varieties. The state of Espirito Santo alone accounts for roughly 60% of Brazilian granite production. Notable varieties include Azul Bahia (a rare blue granite from Bahia state), Via Lattea (a cream-colored stone with subtle veining), and Black Cosmic (a dark granite with golden specks). Brazilian quarries employ diamond wire saws and water-jet cutting technology to extract massive blocks weighing upwards of 40 tons.
India - India ranks among the top five granite producers globally, with major quarrying operations in the states of Tamil Nadu, Karnataka, Andhra Pradesh, and Rajasthan. Indian Absolute Black, quarried in the Khammam and Warangal regions, is prized for its deep, uniform black color. Tan Brown and Kashmir Gold varieties originate from southern Indian quarries. India exported approximately 4.8 million tons of granite in 2021-2022.
Norway - Norwegian granite, particularly Blue Pearl and Emerald Pearl varieties, is quarried in the Larvik region. Larvikite, Norway's national stone, features distinctive blue iridescent feldspar crystals that shimmer in light. Norway's cold climate produces granite with minimal internal stress fractures, resulting in large, structurally sound blocks.
Kitchen Countertop Performance
Granite countertops have dominated the premium kitchen market for decades. A properly sealed granite countertop resists staining from common kitchen substances including coffee, wine, and cooking oils. The stone's natural cool surface is ideal for pastry work, similar to marble, but without marble's vulnerability to acid etching. Granite countertops are typically fabricated in 2 cm or 3 cm thicknesses, with 3 cm slabs recommended for unsupported overhangs up to 25 cm. Seams are filled with color-matched epoxy that cures to a hardness comparable to the stone itself.
Maintenance
Granite requires resealing every 1 to 3 years depending on use and stone porosity. Darker, denser granites generally require less frequent sealing than lighter, more porous varieties. Daily cleaning with mild soap and water is sufficient; abrasive cleaners can dull the polished finish over time. Chips and cracks, though rare, can be repaired with color-matched epoxy by a stone restoration professional.