Blue Calcite
Calcite (Calcium Carbonate) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically occurs in massive or rhombohedral habits, often showing cleavage planes.
Mineral Group
Carbonates (Calcite Group)
Chemical Formula
CaCO3
Formation Process
Sedimentary or Hydrothermal; formed through chemical precipitation or in marine environments as biological remains.
About This Crystal
A semi-translucent to opaque blue and white mineral specimen with a waxy to vitreous luster. This piece exhibits a characteristic soft sky-blue color fading into white crystalline zones.
Physical Characteristics
Color: Blue to white; Streak: White; Cleavage: Perfect rhombohedral in three directions; Fracture: Conchoidal to uneven; Specific Gravity: 2.71; Tenacity: Brittle; Fluorescence: May show weak red or pink under UV.
Optical Properties
Refractive Index: 1.486–1.658; Birefringence: Extremely high (0.172); Optically Uniaxial (-); No significant pleochroism.
Hardness & Durability
Origin Region
Madagascar, Mexico, Brazil; typically forms in sedimentary environments or hydrothermal veins.
Hardness & Durability
Mohs Hardness: 3; very soft and susceptible to scratching. Poor durability for rings; best suited for display or ornaments.
Care & Maintenance
Avoid all acids (even vinegar), cleaners, and ultrasonic devices. Clean only with warm soapy water and a soft cloth. Store separately to avoid scratches from harder minerals.
Rarity & Value
Common; relatively inexpensive. Value depends on color intensity and transparency. Often left in raw 'acid-washed' form to enhance surface luster.
Special Characteristics
Displays strong double refraction if clear enough. Reacts with effervescence (fizzing) when exposed to weak hydrochloric acid.
Lore & History
Historically used in construction and agriculture as lime. In modern traditional lore, it is associated with the throat chakra and is believed to promote calm communication and emotional soothing.