Orange Calcite
Calcite var. Orange Calcite · Decorative Stone and Mineral Specimen
Crystal System
Trigonal, typically forming massive or polished spherical habits in this context
Mineral Group
Carbonates
Chemical Formula
CaCO3
Formation Process
Sedimentary or hydrothermal precipitation from calcium-rich solutions at low to moderate temperatures
About This Crystal
A polished sphere displaying a warm, vibrant orange and white mottled appearance with a vitreous to greasy luster, translucent transparency, and internal cloudiness
Physical Characteristics
Orange to white color with a white streak, perfect rhombohedral cleavage in three directions, conchoidal to uneven fracture, specific gravity of approximately 2.71, brittle tenacity, and sometimes exhibits pinkish or orange fluorescence under UV light
Optical Properties
Uniaxial negative with strong birefringence (double refraction), refractive index ranging from 1.486 to 1.658, and no significant pleochroism
Hardness & Durability
Origin Region
Mexico, Madagascar, Brazil, and the USA; forms in sedimentary, metamorphic, and hydrothermal environments
Hardness & Durability
Mohs hardness of 3, making it very soft and easily scratched by a copper coin or knife; poor toughness due to perfect cleavage, unsuitable for daily-wear jewelry
Care & Maintenance
Clean with a soft damp cloth, avoid harsh chemicals and acids such as vinegar or lemon juice which will etch the surface, and store away from harder stones to prevent scratching
Rarity & Value
Common, widely available as polished spheres, tumbles, and rough specimens; affordable and accessible, rarely subjected to treatments beyond cutting and polishing
Special Characteristics
Strong effervescence when exposed to dilute hydrochloric acid due to the release of carbon dioxide gas
Lore & History
Associated traditionally with the sacral chakra, vitality, emotional release, and clearing negative energy, though these are cultural beliefs rather than scientific claims