Orange Calcite
Calcite var. Orange (Calcium Carbonate) · Semi-Precious Gemstone / Decorative Stone / Mineral Specimen
Crystal System
Trigonal; frequently occurs in massive, rhombohedral, or granular habits. This specimen is a tumbled/polished massive form.
Mineral Group
Carbonates (Calcite Group)
Chemical Formula
CaCO3 (often with traces of Iron or Hematite contributing to the orange hue)
Formation Process
Sedimentary or Hydrothermal; forms through chemical precipitation or in marine environments. It can also form in hydrothermal veins or as a secondary mineral in volcanic cavities.
About This Crystal
A translucent to nearly opaque stone with a deep honey-orange to amber color. It features a waxy to vitreous luster and distinct white internal veining or 'spider-web' patterns caused by internal cleavages and fractures within the crystal lattice.
Physical Characteristics
Color: Orange to yellow-orange; Streak: White; Cleavage: Perfect rhombohedral in three directions; Fracture: Conchoidal to uneven; Specific Gravity: 2.71; Fluorescence: Often fluoresces red or pink under UV light.
Optical Properties
Refractive Index: 1.486 - 1.658; Birefringence: Highly birefringent (strong double refraction); Pleochroism: Weak to absent; Uniaxial negative.
Hardness & Durability
Origin Region
Mexico (most common source), Brazil, USA, and Africa; found in various sedimentary and metamorphic environments.
Hardness & Durability
Mohs Hardness: 3.0 (Soft); Toughness: Poor due to perfect cleavage; Low durability makes it unsuitable for rings but excellent for decorative use or low-impact jewelry.
Care & Maintenance
Clean only with warm soapy water; avoid ultrasonics, steam cleaners, and acids (calcite reacts violently with vinegar/acid). Store separately to prevent scratching from harder stones like quartz.
Rarity & Value
Common; very affordable. Value is determined by color saturation and lack of large brown/dull patches. Often tumble-polished or carved into figurines.
Special Characteristics
Optical doubling (birefringence), waxy surface texture when polished, and characteristic reaction (effervescence) when in contact with dilute hydrochloric acid.
Lore & History
Historically used in various cultures for architectural decoration. In metaphysical traditions, it is associated with the Sacral Chakra, believed to enhance creativity, energy flow, and emotional healing.