Where is Orange Calcite found?
Calcite
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Open the appOrange Calcite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Orange Calcite
Mexico
Known for producing large, high-quality specimens of Orange Calcite, particularly from Chihuahua.
USA
Various localities, including Missouri, Tennessee, and Illinois, yield calcite, with orange varieties found in some areas.
Brazil
Produces various forms of calcite, including some orange varieties.
Peru
Known for mineral deposits, including some occurrences of colored calcite.
Collecting tips
- Acid Test. Calcite reacts vigorously with dilute hydrochloric acid (HCl), producing effervescence (fizzing) as carbon dioxide gas is released. This is a definitive test to distinguish it from similar-looking minerals like quartz or dolomite (which reacts weakly or not at all with cold dilute HCl).
- Hardness Test. With a Mohs hardness of 3, Orange Calcite can be easily scratched by a copper coin (hardness 3.5) or a steel knife (hardness 5-5.5). This helps differentiate it from harder minerals.
- Cleavage Observation. Look for the characteristic perfect rhombohedral cleavage. Broken pieces will typically have rhombic shapes.
- Fluorescence. Some Orange Calcite specimens may exhibit fluorescence under UV light, often glowing orange, red, or pink, due to manganese impurities.
Quick Check
- Color:
- Orange to yellowish-orange
- Luster:
- Vitreous to resinous
- Streak:
- White
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