Which ores are concentrated by levigation washing ?

Explanation

To answer the question "Which ores are concentrated by levigation washing?", we can follow these steps:

### Step 1: Understand Levigation Washing
Levigation washing is a method used to separate ores from impurities based on the difference in their specific gravities. This process is particularly effective when there is a significant difference in density between the ore and the impurities.

### Step 2: Identify Suitable Ores
The ores that are typically concentrated by levigation washing are those that contain oxygenated compounds. These include:
- Oxides
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