Where is Cobaltocalcite found?
Cobalt-bearing Calcite (CaCO3)
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Open the appCobaltocalcite 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 Cobaltocalcite
Katanga Province, Democratic Republic of Congo
World-renowned for producing some of the finest and most intensely colored Cobaltocalcite specimens, often in botryoidal or mammillary forms.
Bou Azzer, Anti-Atlas Mountains, Morocco
Another significant locality, known for producing excellent pink Cobaltocalcite crystals and aggregates, often associated with cobalt arsenides.
Tsumeb Mine, Namibia
Historically produced beautiful specimens, though less common than from Congo or Morocco.
Alston Moor, Cumbria, England
Known for some occurrences, though typically less vibrant than African material.
Various localities in the United States
Minor occurrences have been reported in states like Missouri and Arizona, often in association with lead-zinc-copper deposits.
Collecting tips
- Look for Cobalt-Rich Deposits. Focus your search on areas known for cobalt mineralization, particularly the oxidized zones of sulfide deposits. The presence of other secondary cobalt minerals like erythrite (cobalt bloom) can be a good indicator.
- Examine Hydrothermal Veins. Cobaltocalcite can form in low-temperature hydrothermal veins, so investigate such geological structures in mineralized areas.
- Check for Associated Minerals. It often occurs with other carbonates, quartz, barite, and various cobalt, copper, and nickel minerals. Identifying these associated minerals can help pinpoint potential Cobaltocalcite occurrences.
- Test for Effervescence. Like all calcites, Cobaltocalcite will effervesce (fizz) vigorously when a drop of dilute hydrochloric acid is applied to its surface. This is a key diagnostic test.
- Observe Color and Habit. The distinctive pink to reddish-pink color and common botryoidal or rhombohedral habits are strong indicators.
Quick Check
- Color:
- Pink to reddish-pink
- Luster:
- Vitreous
- Streak:
- White
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