Orange Calcite
Calcite (Variety: Orange Calcite) · Semi-Precious Gemstone / Decorative Mineral Specimen
Crystal System
Trigonal crystal system; typically occurs in massive, rhombohedral, or granular habits. Crystals are rarely well-defined in this mass-produced rough form.
Mineral Group
Carbonates; Calcite Group
Chemical Formula
CaCO3
Formation Process
Sedimentary or Hydrothermal; forms through chemical precipitation in marine environments or the cooling of calcium-rich hydrothermal fluids.
About This Crystal
A semi-translucent to opaque specimen with a waxy to vitreous luster. It exhibits a vibrant honey-orange to light-amber hue with white calcite veining and a characteristic 'soapy' or 'waxy' surface texture when unpolished.
Physical Characteristics
Color: Orange to yellow-orange; Streak: White; Cleavage: Perfect rhombohedral in three directions (may not be obvious in chunky massive form); Fracture: Conchoidal to uneven; Specific Gravity: 2.71; Fluorescence: Often fluoresces pink or red under shortwave UV.
Optical Properties
Refractive Index: 1.486–1.658; Birefringence: Extremely high (0.172), often causing double refraction (doubling of images) in clear specimens; Luster: Vitreous to waxy.
Hardness & Durability
Origin Region
Madagascar and Mexico are the primary commercial sources for this orange variety; forms in sedimentary limestone environments or through hydrothermal deposition.
Hardness & Durability
Mohs Hardness: 3 (Very soft); Toughness: Low/Fragile due to perfect cleavage. Easily scratched by a copper penny or a steel knife.
Care & Maintenance
Avoid all acids (including vinegar/citrus) as they will dissolve the stone. Clean ONLY with warm soapy water. Do not use ultrasonic cleaners. Store separately from harder stones like quartz to prevent scratching.
Rarity & Value
Common; widely available and affordable. Value is determined by color intensity and translucency. Usually sold by weight in rough form.
Special Characteristics
Displays a characteristic 'waxy' or 'greasy' feel to the touch. It reacts violently (effervesces/bubbles) when in contact with dilute hydrochloric acid.
Lore & History
Historically used in decorative carvings. In metaphysical traditions, it is associated with the Sacral Chakra and believed to enhance creativity, playfulness, and confidence. Note: These are traditional cultural beliefs and not scientific facts.