Concentration Of Ores

To solve the problem, we need to identify which of the following is a carbonate ore.

1. Understanding Carbonate Ores:
A carbonate ore is a type of mineral that contains carbonate ions ( ) as part of its chemical composition. Common carbonate ores include minerals like magnesite ( ), calcite ( ), and dolomite ( ).

2. Analyzing the Given Ores:

- Bauxite: Bauxite is an ore of aluminum and primarily consists of aluminum oxide minerals like gibbsite, boehmite, and diaspore. It is not a carbonate ore.
- Magnesite: Magnesite ( ) is a carbonate ore of magnesium. It is the correct answer.
- Haematite: Haematite ( ) is an ore of iron, and it is an oxide ore, not a carbonate.
- Carnalite: Carnalite ( ) is a potassium-magnesium chloride mineral, not a carbonate ore.

Final Answer:
The carbonate ore among the given options is .