Name and formulate the reagent used for the leaching of argentite.

Explanation

**Step-by-Step Solution:**

1. **Identify the Ore**: The ore in question is argentite, which is primarily composed of silver sulfide. The chemical formula for argentite is Ag2S.

2. **Understand the Process of Leaching**: Leaching is a hydrometallurgical process used to extract metals from their ores. In the case of argentite, the leaching process involves the extraction of silver.

3. **Crushing and Concentration**: The first steps in the leaching process involve crushing the argentite ore to increase the surface area and then concentrating it to remove impurities.

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