Honey Calcite (Orange Onyx)

Physical Properties

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.

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.

Identified on: 4/29/2026

Mode: Standard