Green Calcite
Calcite (Calcium Carbonate) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically occurs in massive, rhombohedral, or tumbled habits as seen here.
Mineral Group
Carbonates (Calcite Group)
Chemical Formula
CaCO3 (with trace inclusions of chlorite or other minerals for color)
Formation Process
Sedimentary or hydrothermal; forms via chemical precipitation in marine environments or hot springs.
About This Crystal
A tumbled, translucent pale lime-green stone with a waxy to vitreous luster and visible internal white cleavage planes.
Physical Characteristics
Color: pale green; Streak: white; Cleavage: perfect rhombohedral in three directions; Fracture: conchoidal; Specific Gravity: 2.71.
Optical Properties
Highly birefringent (double refraction); Refractive Index: 1.486–1.658; Uniaxial negative.
Hardness & Durability
Origin Region
Mexico (notably Chihuahua), Brazil, and the USA.
Hardness & Durability
Mohs hardness: 3. Very soft and brittle; prone to scratching and acid erosion.
Care & Maintenance
Avoid acids (vinegar/lemon), ultrasonic cleaners, and harsh chemicals. Clean with soft damp cloth and store separately.
Rarity & Value
Common; relatively inexpensive and widely available. Value is based on color saturation and translucency.
Special Characteristics
Displays strong acid reaction (effervescence) and occasionally fluorescence under UV light.
Lore & History
Historically used in limestone and marble forms; modernly associated with the heart chakra and emotional release.