mineral

Honey Calcite (Orange Onyx)

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale (can be scratched by a copper coin or steel). Color: Honey yellow to deep orange with distinct parallel banding. Luster: Vitreous to waxy. Crystal structure: Hexagonal (Trigonal). Cleavage: Perfect rhombohedral.

Hardness: 3 on Mohs scale (can be scratched by a copper coin or steel)
Color: Honey yellow to deep orange with distinct parallel banding
Luster: Vitreous to waxy

Identified April 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the chemical precipitation of calcium carbonate from mineral-rich waters in caves or around hot springs, often creating layered deposits known commercially as 'onyx marble.'

Uses & applications

Primarily used for decorative purposes, including ornamental carvings, architectural accents, crystal healing, and as polished collector specimens.

Geological facts

Despite being called 'onyx' in the trade, it is actually a variety of calcite or travertine. True onyx is a form of cryptocrystalline quartz (chalcedony) and is much harder than this specimen.

Field identification & locations

Identify in the field by its characteristic softness (scrachable with a knife) and its rapid effervescence (bubbling) when a drop of cold dilute hydrochloric acid is applied. Look for the distinct translucent bands.

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mineral