Green Calcite
Calcite var. Green (Carbonate mineral) · Collector Mineral / Semi-Precious Decorative Stone
Crystal System
Trigonal; typically occurs in massive or rhombohedral habits with perfect rhombohedral cleavage.
Mineral Group
Carbonates; Calcite Group
Chemical Formula
CaCO3
Formation Process
Forms through sedimentary processes, chemical precipitation in groundwater, or hydrothermal veins.
About This Crystal
Translucent to opaque pale green specimen with a distinct waxy to vitreous luster. Surface appears smooth and slightly 'soapy' due to its low hardness, often showing white internal cleavage planes.
Physical Characteristics
Color: Mint to seafoam green; Streak: White; Cleavage: Perfect rhombohedral in three directions; Fracture: Uneven; SG: 2.71; Fluorescence: Often glows pink or red under UV light.
Optical Properties
Refractive Index: 1.486 - 1.658; strongly doubly refractive (birefringent), though less visible in massive specimens.
Hardness & Durability
Origin Region
Major sources include Mexico, Brazil, and Canada (specifically Quebec); typically found in sedimentary and metamorphic environments.
Hardness & Durability
Mohs Hardness: 3; very soft and brittle. Not recommended for rings; sensitive to acids and scratches easily.
Care & Maintenance
Clean only with warm soapy water; avoid ultrasonic and steam cleaners. Keep away from acids (even vinegar) and harder gemstones to prevent scratching.
Rarity & Value
Common; relatively inexpensive. Value is determined by color intensity and transparency. Often acid-washed to give it a smooth, waxy surface.
Special Characteristics
Effervesces (fizzes) instantly when in contact with dilute hydrochloric acid; notable for its waxy texture and rhombohedral cleavage structure.
Lore & History
Historically used as a flux in metal smelting. In metaphysical traditions, it is associated with the Heart Chakra and believed to aid in emotional cooling and mental clarity.