Manganoan Calcite
Calcite var. Manganoan Calcite · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; massive, granular, or rhombohedral habit
Mineral Group
Carbonates
Chemical Formula
(Ca,Mn)CO3
Formation Process
Sedimentary or Hydrothermal; forms through chemical precipitation in manganese-rich environments.
About This Crystal
This specimen exhibits a soft baby-pink to pale flesh color with an opaque transparency and a dull to waxy luster. It appears as a chunky, massive fragment with rough surface texture and no visible crystal faces.
Physical Characteristics
Color: Pink; Streak: White; Cleavage: Perfect rhombohedral (though not visible in this massive form); Specific Gravity: 2.71-2.85; Fluorescence: Strong bright pink under shortwave UV light.
Optical Properties
Refractive Index: 1.486 - 1.658; Birefringence: High (0.172); Uniaxial negative; no significant pleochroism in massive forms.
Hardness & Durability
Origin Region
Notable sources include Peru, Mexico, Bulgaria, and Romania; often found in hydrothermal veins.
Hardness & Durability
Mohs Hardness: 3; Toughness: Poor (brittle); vulnerable to acids and scratches easily. Not recommended for high-wear jewelry.
Care & Maintenance
Clean only with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, and all acids (even vinegar). Store separately to prevent scratches from harder minerals.
Rarity & Value
Relatively common; value is determined by the intensity of the pink color and the strength of its UV fluorescence. High-grade specimens are used in carvings.
Special Characteristics
Notable for its vivid pink fluorescence under ultraviolet light due to the presence of manganese.
Lore & History
Known traditionally as a 'stone of peace,' it is culturally associated with the Heart Chakra and emotional healing. Historically, calcites have been used since ancient times for lime production and various decorative purposes.