mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Yellow-orange to deep orange; Luster: Vitreous to waxy/pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71.

Hardness: 3 on Mohs scale
Color: Yellow-orange to deep orange
Luster: Vitreous to waxy/pearly

Identified June 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often as a chemical precipitate from mineral-rich waters in caves or hot springs, or through metamorphic processes from limestone. It is found in deposits ranging from Paleozoic to more recent geological eras.

Uses & applications

Mainly used as a decorative stone, in lapidary work for carvings and spheres, and as a popular specimen for gemstone collectors. Industrially, calcite is used in cement, agriculture, and chemical manufacturing.

Geological facts

Orange Calcite is often associated with creativity and emotional healing in metaphysical circles. It is exceptionally soft compared to quartz, making it easy to carve but prone to scratching. It will strongly effervesce (fizz) when in contact with weak hydrochloric acid.

Field identification & locations

Identify in the field by its distinct waxy feel, rhombohedral cleavage, and low hardness (can be scratched by a copper coin). Found globally with notable deposits in Mexico, Brazil, and the USA. Collectors should look for vibrant color and transparency.