Where is Orange Calcite found?
Calcite (CaCO3)
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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
Significant deposits, particularly in the state of San Luis Potosí, are known for producing large, high-quality orange calcite specimens.
USA
Various localities, including Tennessee, Missouri, and Oklahoma, yield orange calcite, often associated with lead-zinc deposits or limestone formations.
Brazil
Known for producing various calcite varieties, including orange calcite, often found in pegmatites or hydrothermal veins.
Peru
Deposits of orange calcite are found, often associated with other carbonate minerals.
Collecting tips
- Look for Carbonate-Rich Environments. Search in areas with limestone, marble, or dolostone outcrops, as calcite is the primary mineral in these rocks. Hydrothermal vein systems can also host well-formed crystals.
- Test for Effervescence. Calcite reacts vigorously with dilute hydrochloric acid (HCl), producing effervescence (fizzing) due to the release of carbon dioxide. This is a definitive test for calcite.
- Observe Cleavage. Look for the characteristic perfect rhombohedral cleavage. Even in massive forms, small cleavage planes might be visible.
- Check Hardness. Calcite has a Mohs hardness of 3, meaning it can be easily scratched by a copper coin (hardness ~3.5) but will scratch gypsum (hardness 2).
- Examine Color and Luster. Identify the distinctive orange to yellowish-orange color and the vitreous to waxy luster.
Quick Check
- Color:
- Orange to yellowish-orange
- Luster:
- Vitreous to waxy
- Streak:
- White
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