Orange Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale to deep orange/honey; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & Geological History

Formed through both chemical precipitation and organic processes. Often found in sedimentary environments such as limestone caves (as stalactites/stalagmites) or as a vein mineral in hydrothermal deposits.

Uses & Applications

Used primarily in lapidary arts for carvings, spheres, and tumbled stones. Also used as a mineral specimen for collectors and in alternative medicine practices for its purported energizing properties.

Geological Facts

Orange calcite gets its distinct color from tiny inclusions of iron oxide or hematite. It is one of the most common minerals in the Earth's crust and is a main component of seashells.

Field Identification & Locations

Identify in the field by its softness (can be scratched by a copper coin) and its reaction to cold dilute hydrochloric acid (it will effervesce/fizz). Commonly found in Mexico, Brazil, and the USA (Tennessee/Kansas).

Identified on: 4/27/2026

Mode: Standard