Blue Calcite with Hematite Inclusions
Calcite var. Blue Calcite (Calcium Carbonate) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically found in massive, microcrystalline, or rhombohedral habits
Mineral Group
Carbonates (Calcite group)
Chemical Formula
CaCO3 with Fe2O3 (Hematite) and various trace elements
Formation Process
Sedimentary precipitation or metamorphic recrystallization of calcium-rich solutions
About This Crystal
A sky-blue to gray-blue translucent stone with a waxy to vitreous luster. This specimen features reddish-brown earthy inclusions, likely hematite or iron oxides, coating portions of the surface and entering internal fractures.
Physical Characteristics
Blue body color with white streak, perfect rhombohedral cleavage (though often obscure in massive form), sub-conchoidal to uneven fracture, specific gravity of 2.71, often shows white or light blue fluorescence under longwave UV.
Optical Properties
Uniaxial negative; refractive index of 1.486–1.658; very high birefringence (though not easily visible in massive rough specimens)
Hardness & Durability
Origin Region
Madagascar and Mexico; typically found in sedimentary limestone or metamorphic environments
Hardness & Durability
Mohs hardness 3; very soft and brittle; susceptible to scratching by copper or steel; low toughness due to perfect cleavage planes
Care & Maintenance
Avoid all acids (even vinegar) which will cause effervescence; clean only with warm soapy water; do not use ultrasonic cleaners; store away from harder minerals like quartz
Rarity & Value
Relatively common; value is based on the intensity of the blue color and size; usually inexpensive and sold by weight or as decorative pocket stones
Special Characteristics
Waxy 'soapy' feel to the touch; reacts (fizzes) instantly when in contact with cold dilute hydrochloric acid; color is often attributed to light scattering or trace impurities
Lore & History
Historically used as a source of lime and in early metallurgy. In modern crystal lore, it is believed to be a stone of emotional soothing, communication, and relaxation, often associated with the Throat Chakra.