mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: Pale orange to honey-yellow; Luster: Vitreous (glassy) to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale (can be scratched by a copper coin)
Color: Pale orange to honey-yellow
Luster: Vitreous (glassy) to waxy

Identified February 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, primarily from the chemical precipitation of calcium-rich solutions or the accumulation of shell, coral, and algal debris in marine environments. It can also form as a secondary mineral in igneous and metamorphic rocks through hydrothermal activity.

Uses & applications

Used widely for decorative carvings, lapidary work, and as a spiritual 'cleansing' stone in metaphysical circles. In industrial form, calcite is used in cement, fertilizers, and as an acid neutralizer in chemical processes.

Geological facts

Orange calcite gets its distinct color from tiny inclusions of iron oxide (hematite) or other organic impurities. It is one of the most common minerals on Earth, constituting a large portion of the Earth's crust by weight within limestone and marble.

Field identification & locations

Identify in the field by its characteristic rhombohedral cleavage and its high reactivity to cold dilute hydrochloric acid (it will fizz/effervesce). It is commonly found in Mexico, Brazil, and the USA (Utah). Softness and susceptibility to acid are key distinguishing factors from quartz.