Where is Malachite in Limonite found?
Cu2(CO3)(OH)2 in FeO(OH)·nH2O
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Open the appMalachite in Limonite 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 Malachite in Limonite
Democratic Republic of Congo (DRC)
World-renowned for large, high-quality malachite specimens, often found in association with iron oxides.
Russia (Ural Mountains)
Historically significant source of malachite, including large deposits where it occurred with iron ores.
Arizona, USA
Numerous copper mines (e.g., Bisbee, Morenci) have produced malachite in limonite from their oxidized zones.
Australia (e.g., Broken Hill, Mount Isa)
Significant copper deposits often feature malachite and other secondary copper minerals in iron-rich gossans.
Chile
Large porphyry copper deposits often have extensive supergene enrichment zones with malachite and limonite.
Collecting tips
- Look for Gossans. Explore the weathered, iron-stained caps (gossans) above sulfide ore bodies. These are prime locations for secondary copper minerals like malachite and iron oxides like limonite.
- Identify Green Stains. Malachite's distinctive green color is a strong indicator. Look for green coatings, crusts, or veins within yellowish-brown to reddish-brown iron-rich rocks.
- Check Mine Dumps. Old copper mine dumps are excellent places to find specimens, as miners often discarded material not rich enough for primary ore extraction but still containing interesting secondary minerals.
- Test with Acid (Caution!). Malachite will effervesce (fizz) vigorously when a drop of dilute hydrochloric acid is applied, due to its carbonate content. Always use caution and appropriate safety gear when handling acids.
Quick Check
- Color:
- Vibrant green (malachite) on yellowish-brown to dark brown (limonite)
- Luster:
- Silky to dull (malachite), earthy to dull (limonite)
- Streak:
- Light green (malachite), yellowish-brown (limonite)
Explore Malachite in Limonite
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