mineral

Orange Calcite (Honey Calcite)

Calcite (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: honey-orange, yellow-orange, and cream banding; Luster: vitreous to pearly or resinous; Crystal structure: trigonal/hexagonal; Cleavage: perfect rhombohedral (often visible internally); Specific gravity: ~2.71

Hardness: 3 on Mohs scale
Color: honey-orange, yellow-orange, and cream banding
Luster: vitreous to pearly or resinous

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed by precipitation of calcium carbonate from mineral-rich solutions in sedimentary environments, limestone caverns (as flowstone/travertine), or hydrothermal vein deposits.

Uses & applications

Commonly carved and polished into ornamental shapes such as eggs, spheres, and figurines; popular in metaphysical and lapidary collections; crushed calcite is used in manufacturing, agriculture, and construction.

Geological facts

Often commercially marketed as 'Onyx' or 'Mexican Onyx', despite being composed entirely of soft calcite rather than true silica onyx (chalcedony). It strongly effervesces (fizzes) when exposed to dilute acids like vinegar.

Field identification & locations

Identifiable by its softness (easily scratched by a copper coin or steel nail), prominent internal cleavage planes, and strong reaction with dilute hydrochloric acid. Major decorative deposits come from Mexico, Pakistan, and the United States.