Which of the following is/are NOT copper-bearing mineral(s)?
- Bornite
- Chalcocite
- Braunite
- Chrysocolla
The Correct Option is C
Solution and Explanation
To determine which of the given options are not copper-bearing minerals, let's examine each mineral:
- Bornite: Bornite is a sulfide mineral with the chemical formula Cu5FeS4. It is a well-known copper ore and is commonly referred to as peacock ore due to its iridescent tarnish. Hence, Bornite is a copper-bearing mineral.
- Chalcocite: Chalcocite (Cu2S) is another valuable copper sulfide mineral. It is one of the most important copper ores and contains about 80% copper by weight, making it a significant copper-bearing mineral.
- Braunite: Braunite is a manganese silicate mineral with the formula Mn2+Mn3+6SiO12. It does not contain copper. Its main components are manganese and silicon, making it a non-copper-bearing mineral.
- Chrysocolla: Chrysocolla is a hydrated copper phyllosilicate mineral with a variable formula: (Cu,Al)2H2Si2O5(OH)4·nH2O. It is often found in the oxidized zones of copper ore bodies. Thus, Chrysocolla is a copper-bearing mineral.
Among the options, Braunite is the mineral that does not contain copper. Therefore, the correct answer is Braunite.
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