Malachite
Malachite · Decorative Stone and Semi-Precious Gemstone
Crystal System
Monoclinic; typically forms as botryoidal, fibrous, or stalactitic masses, rarely as distinct crystals
Mineral Group
Carbonates (specifically a basic copper carbonate)
Chemical Formula
Cu2CO3(OH)2
Formation Process
Supergene oxidation zones of copper ore deposits, forming via low-temperature hydrothermal or weathering processes where circulating groundwaters interact with copper-bearing minerals
About This Crystal
An opaque, polished oval cabochon displaying vibrant shades of green ranging from deep forest green to lighter spring green. It exhibits distinctive, striking concentric banding and undulating swirling patterns characteristic of botryoidal growth, with a smooth, glossy, vitreous-to-silky luster.
Physical Characteristics
Color: bright green to dark green with light and dark bands. Streak: pale green. Cleavage: perfect in one direction, though rarely observed in polished pieces. Fracture: subconchoidal to uneven. Specific gravity: 3.6 to 4.0. Tenacity: brittle.
Optical Properties
Biaxial (-) with refractive indices around nα = 1.655, nβ = 1.875, nγ = 1.909. Strongly pleochroic in shades of green. It is doubly refractive.
Hardness & Durability
Origin Region
Democratic Republic of the Congo, Russia (Ural Mountains), Australia, France, and the USA (Arizona)
Hardness & Durability
Mohs hardness of 3.5 to 4, making it relatively soft and easily scratched. It has poor toughness and is sensitive to acids, ammonia, and heat.
Care & Maintenance
Clean gently with warm, soapy water and a soft cloth. Never use ultrasonic or steam cleaners, and avoid harsh chemicals, acids, and prolonged exposure to direct sunlight or high heat.
Rarity & Value
Common to uncommon depending on the quality of the pattern and size. High-quality banded material from the Congo or the classic Russian deposits can command higher collector values. Treatments are rare, but synthetic imitations made of glass or plastic exist.
Special Characteristics
Renowned for its chatoyant-like banding and distinctive concentric eye-like patterns when cut and polished. It is soft and reacts with effervescence to dilute hydrochloric acid due to its carbonate composition.
Lore & History
Historically used by ancient Egyptians, Greeks, and Romans for amulets, jewelry, and ground into eye shadow pigments. In modern crystal healing, it is known as the 'stone of transformation,' traditionally associated with the heart chakra, emotional healing, and absorbing negative energies, though these are cultural beliefs rather than scientific claims.