Orange Calcite (Carved as a Horned Skull)

Physical Properties

Hardness: 3 on Mohs scale; Color: Orange to honey-colored with gray banding; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & Geological History

Formed through sedimentary precipitation in hydrothermal environments, cave deposits, or marine settings. It can occur in massive forms which are then carved. Common in various geological ages ranging from Paleozoic to Cenozoic.

Uses & Applications

Primarily used as decorative lapidary material, ornamental carvings, and metaphysical/collectible items. Also used industrially in cement and as a soil conditioner in its raw state.

Geological Facts

Calcite is one of the most common minerals on Earth and is the primary constituent of limestone and marble. Orange calcite specifically contains microscopic inclusions of hematite or other iron oxides that give it its vibrant color.

Field Identification & Locations

Identify in the field by its softness (can be scratched by a copper coin) and its vigorous effervescence (bubbling) when in contact with cold dilute hydrochloric acid. It is commonly found in Mexico, Brazil, and the USA.

Identified on: 4/29/2026

Mode: Standard