Blue Calcite
Calcite · Mineral Specimen and Decorative Stone
Crystal System
Trigonal, massive to rhombohedral habit
Mineral Group
Carbonates
Chemical Formula
CaCO3
Formation Process
Sedimentary and hydrothermal processes, often precipitating from calcium-rich water solutions under varying temperature and pressure conditions
About This Crystal
A pale to medium blue crystalline mineral mass featuring translucent to opaque properties with a vitreous to pearly luster and distinct cleavage planes visible across the surface
Physical Characteristics
Pale blue color with a white streak, perfect rhombohedral cleavage in three directions at 75-degree angles, uneven fracture, specific gravity of approximately 2.71, and brittle tenacity with possible fluorescence under UV light
Optical Properties
Strong double refraction (birefringence), uniaxial negative optic sign, and refractive indices ranging from 1.486 to 1.658
Hardness & Durability
Origin Region
Madagascar, Mexico, and the United States; typically forms in sedimentary, metamorphic, and hydrothermal environments
Hardness & Durability
Mohs hardness of 3, very low durability and poor toughness due to perfect cleavage, making it completely unsuitable for everyday jewelry wear
Care & Maintenance
Extremely soft and sensitive to acids such as vinegar and household cleaners; should be cleaned only with a soft damp cloth, avoiding ultrasonic cleaners, harsh chemicals, and prolonged direct sunlight
Rarity & Value
Common mineral, readily available as rough specimens and polished stones, with value determined by color intensity, size, and clarity
Special Characteristics
Exhibits strong double refraction (optical doubling) and strong cleavage, with some specimens showing weak phosphorescence or fluorescence under ultraviolet light
Lore & History
Widely used in modern crystal healing practices as a soothing stone associated with the throat chakra, promoting calm communication and emotional release, though these are strictly traditional beliefs without scientific backing