Granite
Granite (Igneous Rock) · Mineral Specimen / Decorative Stone / Industrial Material
Crystal System
Multisystem / Aggregate (composed of multiple minerals with individual crystal systems such as Trigonal, Monoclinic, and Triclinic)
Mineral Group
Silicate Rock (Igneous intrusive rock)
Chemical Formula
Complex silicate rock composed primarily of Quartz (SiO2), Alkali Feldspar (KAlSi3O8), and Plagioclase Feldspar ((Na,Ca)Al(Si,Al)Si2O8), with accessory minerals like Biotite and Hornblende
Formation Process
Igneous process involving the slow cooling and crystallization of magma rich in silica and alkali elements beneath the Earth's surface
About This Crystal
A small, weathered, light-colored intrusive igneous rock fragment showing a granular, phaneritic texture. The specimen exhibits a speckled grey and white appearance with interlocking mineral grains, typical of weathered granite, with visible light quartz and dark biotite or hornblende flecks.
Physical Characteristics
Color varies widely from white and grey to pink, with a white streak; uneven or granular fracture; excellent hardness due to constituent minerals; specific gravity ranges from 2.65 to 2.75; tenacity is brittle
Optical Properties
Varies by constituent mineral grains; overall aggregate appearance is opaque with a dull to vitreous luster depending on individual mineral facets exposed
Hardness & Durability
Origin Region
Found globally in continental crusts worldwide; major producers include Brazil, India, China, Scandinavia, and North America
Hardness & Durability
Mohs hardness typically around 6 to 7 for the bulk rock, driven by quartz and feldspar constituents; high durability and resistance to weathering, making it suitable for architectural and decorative use
Care & Maintenance
Requires minimal maintenance; can be cleaned with warm water and mild soap; avoid harsh acid cleaners if carbonate-bearing minerals are present
Rarity & Value
Extremely common; low value as a raw rock specimen, though specific decorative varieties can command standard dimensional stone prices
Special Characteristics
Composed of an intergrowth of multiple distinct minerals giving it a salt-and-pepper or patterned aesthetic texture
Lore & History
Historically used extensively in ancient architecture, monuments, and sculpture (such as in Ancient Egypt); in modern metaphysical practices, granite is sometimes associated with grounding strength, stability, and emotional resilience