Cobaltoan Calcite
Calcite var. Cobaltoan Calcite (Cobaltoan-bearing Calcite) · Mineral Specimen / Collector Mineral
Crystal System
Trigonal - Hexagonal Scalenohedral; typically occurs in massive, botryoidal, or tiny druzy crystal habits
Mineral Group
Carbonates (Calcite Group)
Chemical Formula
(Ca,Co)CO3 (Calcium Carbonate with Cobalt impurities affecting coloration)
Formation Process
Secondary hydrothermal mineral formed in the oxidation zones of cobalt-bearing ore deposits
About This Crystal
Vibrant magenta to hot pink druzy crystals coating a host rock. Typically exhibits a vitreous to pearly luster with translucent to opaque transparency in massive forms.
Physical Characteristics
Pink to deep magenta color; white streak; perfect rhombohedral cleavage; conchoidal fracture; specific gravity 2.7-2.9; may show weak fluorescence under UV light
Optical Properties
Uniaxial (-); high birefringence; Refractive Index 1.486 - 1.658; distinct pleochroism in deeply colored specimens
Hardness & Durability
Origin Region
Notably sourced from the Katanga Province (Democratic Republic of Congo) and Bou Azzer (Morocco)
Hardness & Durability
Mohs hardness of 3; very soft and brittle; poor durability for jewelry unless protected in pendants
Care & Maintenance
Avoid acids (vinegar etc) which dissolve it; clean only with warm soapy water; do not use ultrasonic cleaners; store away from harder stones to prevent scratching
Rarity & Value
Uncommon; value is driven by the intensity of the pink color and the coverage of crystals on the matrix
Special Characteristics
Distinctive 'Electric Pink' color caused by cobalt; often found associated with other minerals like Malachite or Kolwezite
Lore & History
Historically used as an indicator mineral for cobalt ores; traditionally associated with the Heart Chakra and emotional healing in crystal lore