Orange Calcite
Calcite var. Orange (Calcium Carbonate) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal crystal system; typically found in massive, rhombohedral, or granular habits. Crystals are rare in this variety, which usually appears as solid chunks.
Mineral Group
Carbonates (Calcite group)
Chemical Formula
CaCO3 (often with iron or manganese inclusions contributing to the orange hue)
Formation Process
Primarily formed via sedimentary processes (chemical precipitation in marine environments) or in hydrothermal veins where calcium-rich fluids cool and crystallize.
About This Crystal
An opaque to translucent mineral with a vibrant orange to pale peach color. It features a characteristic waxy or 'soapy' luster on raw surfaces. The internal structure often shows white banding or internal cleavages.
Physical Characteristics
Color: Orange to salmon-pink; Streak: White; Cleavage: Perfect rhombohedral in three directions; Fracture: Conchoidal to uneven; Specific Gravity: 2.71; Fluorescence: Often shows weak red or orange glow under UV light.
Optical Properties
Refractive Index: 1.486 - 1.658; Birefringence: Extremely high (0.172); Optically Uniaxial (-); No significant pleochroism in massive forms.
Hardness & Durability
Origin Region
Mexico is the most common source for high-quality orange calcite; also found in Brazil, USA, and Canada. Often found in large sedimentary deposits or hydrothermal veins.
Hardness & Durability
Mohs Hardness: 3. This is a very soft stone. It is brittle and easily scratched by glass or steel. It has poor toughness due to perfect cleavage.
Care & Maintenance
Extremely sensitive to acids (will effervesce and dissolve). Clean only with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, and harsh chemicals. Store separately to prevent scratches.
Rarity & Value
Common and affordable. Value is determined by color intensity and translucency. Large decorative soap-like chunks are inexpensive and common in the market; rarely faceted due to softness.
Special Characteristics
Displays double refraction when clear. The orange variety is specifically known for its waxy surface texture that feels different from the vitreous luster of quartz.
Lore & History
Historically used as a source of lime and in decorative carvings. In metaphysical traditions, it is associated with the Sacral and Solar Plexus chakras, believed to enhance creativity, energy flow, and emotional balance.