Blue Calcite
Calcite (Sky Blue variety) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically occurs in massive or rhombohedral forms
Mineral Group
Carbonates
Chemical Formula
CaCO3 (Calcium Carbonate)
Formation Process
Sedimentary or Hydrothermal; forms through the chemical precipitation of calcium-rich solutions in caves or veins
About This Crystal
A pale, sky-blue specimen with a waxy to vitreous luster. This specific piece appears to be a raw, massive chunk with translucent to opaque sections and a grainy texture.
Physical Characteristics
Color: Baby blue; Streak: White; Cleavage: Perfect rhombohedral (3 directions); Fracture: Conchoidal; Specific Gravity: 2.71; Fluorescence: Often pink or red under UV light
Optical Properties
Refractive Index: 1.486 - 1.658; extremely high birefringence (double refraction); uniaxial negative
Hardness & Durability
Origin Region
Madagascar, Mexico, and South Africa; found in sedimentary limestone environments
Hardness & Durability
Mohs hardness of 3; very soft and brittle; susceptible to scratching by copper or steel; high cleavage makes it fragile
Care & Maintenance
Clean with warm soapy water only; avoid ultrasonic cleaners, acids (will dissolve/fizz in vinegar), and prolonged sunlight
Rarity & Value
Common; relatively inexpensive; value is determined by color intensity and size; often seen in rough form or tumbled stones
Special Characteristics
Effervesces (bubbles) when in contact with dilute hydrochloric acid; exhibits a distinct 'waxy' feel when handled
Lore & History
Historically used as a decorative stone; in metaphysical lore, it is associated with the throat chakra, believed to aid communication, calm the nerves, and enhance creative expression.