mineral
Orange Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale; Color: Orange, honey-yellow; Luster: Vitreous to waxy/resinous; Crystal System: Trigonal (often found as rhombohedral fragments); Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Orange, honey-yellow
- Luster
- Vitreous to waxy/resinous
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Physical properties
Hardness: 3 on Mohs scale; Color: Orange, honey-yellow; Luster: Vitreous to waxy/resinous; Crystal System: Trigonal (often found as rhombohedral fragments); Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71
Formation & geological history
Formed through sedimentary processes such as precipitation from calcium-rich solutions in caves or marine environments, or as a secondary mineral in igneous and metamorphic rocks. Most specimens on the market are from the Holocene to Cenozoic era.
Uses & applications
Used primarily for decorative carvings, lapidary work (cabochons), as acid-neutralizing agents in industry, and widely collected by mineral enthusiasts for its vibrant color.
Geological facts
Orange Calcite often appears 'waxy' to the touch due to acid-washing treatments used by wholesalers to smooth the surface. It will vigorously effervesce (fizz) when in contact with dilute hydrochloric acid.
Field identification & locations
Identify in the field by its softness (readily scratched by a copper penny or steel knife) and its distinct rhombohedral cleavage. Commonly found in Mexico, Brazil, and the USA (Utah).
