Question

Which of the following is/are NOT copper-bearing mineral(s)?

• A. Bornite
• B. Chalcocite
• C. Braunite
• D. Chrysocolla

Answer 1

The Correct Option is C

To determine which of the given options are not copper-bearing minerals, let's examine each mineral:

1. 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.
2. 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.
3. 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.
4. 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.