Yellow Calcite
Calcite · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, typically forming scalenohedral, rhombohedral, or massive habits with frequent twinning.
Mineral Group
Carbonates (Anhydrous Carbonates)
Chemical Formula
CaCO3
Formation Process
Sedimentary, metamorphic, and hydrothermal precipitation from calcium-rich solutions at low to moderate temperatures.
About This Crystal
The specimen consists of small, tumbled, smooth pebbles with a pale yellow to translucent white coloration, waxy to vitreous luster, and semi-translucent transparency.
Physical Characteristics
Color ranges from pale yellow to white; white streak; perfect rhombohedral cleavage in three directions at 75-degree angles; conchoidal to uneven fracture; specific gravity around 2.71; brittle tenacity; displays strong white to yellow fluorescence under shortwave UV light.
Optical Properties
Uniaxial negative with strong birefringence, resulting in a distinct double refraction effect visible when viewed through transparent crystals.
Hardness & Durability
Origin Region
Global distribution with notable deposits in Mexico, Brazil, USA, and Madagascar. Forms in sedimentary, metamorphic, and hydrothermal environments.
Hardness & Durability
Mohs hardness of 3, making it very soft and easily scratched by a copper coin. Low durability, not recommended for rings or high-wear jewelry.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, steam, and acidic solutions as calcite dissolves in acid. Store separately to prevent scratching.
Rarity & Value
Common mineral with low to moderate value depending on size, clarity, and color saturation; typically inexpensive and widely available.
Special Characteristics
Strong birefringence, pronounced cleavage, and strong fluorescence under ultraviolet light.
Lore & History
Historically used in various decorative objects and optical instruments (Iceland spar). In modern metaphysical practices, yellow calcite is associated with the solar plexus chakra, vitality, and clearing negative energy.