Green Calcite
Calcite var. Green Calcite · Mineral Specimen / Semi-Precious / Decorative Stone
Crystal System
Trigonal, typically occurs as rhombohedral crystals, massive, or tumbled stones
Mineral Group
Carbonates (Anhydrous Carbonates)
Chemical Formula
CaCO3
Formation Process
Sedimentary, metamorphic, and hydrothermal environments, typically formed through the precipitation of calcium carbonate from water solutions
About This Crystal
A tumbled, smooth stone exhibiting a vibrant yellow-green to olive-green color with translucent to opaque sections and visible internal cloudiness and fractures typical of tumbled carbonates
Physical Characteristics
Green color caused by iron or inclusions, white streak, perfect rhombohedral cleavage in three directions, conchoidal to uneven fracture, specific gravity around 2.71, brittle tenacity, reacts with effervescence to dilute hydrochloric acid
Optical Properties
Uniaxial negative, strong birefringence (double refraction), vitreous to pearly luster on cleavage surfaces
Hardness & Durability
Origin Region
Mexico, Brazil, Madagascar, and the United States
Hardness & Durability
Mohs hardness of 3, very low toughness due to perfect cleavage, highly sensitive to acids and scratches, very poor wearability for rings or daily-wear jewelry
Care & Maintenance
Clean with a soft, damp cloth; avoid ultrasonic cleaners, steam, and harsh chemical cleaners or acids; store separately to prevent scratching by harder minerals
Rarity & Value
Common mineral, very affordable; value depends on color intensity, size, and clarity
Special Characteristics
Strong birefringence and potential fluorescence under UV light, effervesces with acid
Lore & History
Often associated with the heart chakra, traditionally used in crystal healing to promote mental balance, release past emotional trauma, and invite prosperity and renewal