Orange Calcite
Calcite var. Orange Calcite · Semi-Precious Gemstone / Decorative Stone / Mineral Specimen
Crystal System
Trigonal; this specimen is carved into a heart shape, but naturally occurs in rhombohedral crystals or massive/granular forms.
Mineral Group
Carbonates (Calcite Group)
Chemical Formula
CaCO3 (Calcium Carbonate) with possible inclusions of Iron Oxide (Hematite) or Goethite
Formation Process
Sedimentary or Hydrothermal; forms through chemical precipitation in marine environments or through magnesium-rich fluids in limestone cavities.
About This Crystal
A translucent to semi-opaque orange specimen with a waxy to vitreous luster. It exhibits internal fracture planes and white 'cleavage' inclusions typical of the calcite mineral family.
Physical Characteristics
Color: Honey-orange to bright orange. Streak: White. Cleavage: Perfect rhombohedral in three directions. Fracture: Conchoidal. Specific Gravity: 2.71. Fluorescence: Often shows weak red or orange under UV light.
Optical Properties
Refractive Index: 1.486 - 1.658. Highly Birefringent (Strong Double Refraction). Non-pleochroic. Lacks significant dispersion.
Hardness & Durability
Origin Region
Notably sourced from Mexico and Brazil; forms in sedimentary limestone environments or hydrothermal veins.
Hardness & Durability
Mohs Hardness: 3. Very soft and brittle. Poor durability for rings; best suited for pendants or decorative display. Sensitive to acids (effervesces).
Care & Maintenance
Avoid all acids, including vinegar and citrus. Clean only with warm soapy water and a soft cloth. Do not use ultrasonics. Store away from harder stones like quartz to prevent scratching.
Rarity & Value
Common. Value is determined by color intensity and size. Usually inexpensive, ranging from $2-$15 for small carved pieces. Often acid-washed to create a smooth, waxy surface.
Special Characteristics
Strong double refraction (though harder to see in opaque/massive pieces) and a distinctive 'waxy' texture when polished. May exhibit white internal 'veining' from micro-fractures.
Lore & History
Historically used in limestone for architecture. In modern metaphysical practices, it is associated with the Sacral Chakra and believed to enhance creativity, energy flow, and emotional healing.