The raw material for obtaining fluorine is fluorspar, also known as fluorite, which is a mineral composed primarily of calcium fluoride (CaF2).

Here's how fluorine is extracted from fluorspar:

1. Extraction: Fluorspar is mined and crushed into a powder.

2. Reaction with sulfuric acid: The fluorspar powder is reacted with concentrated sulfuric acid (H2SO4) at high temperatures. This process generates hydrogen fluoride (HF) gas:

```

CaF2 + H2SO4 → CaSO4 + 2HF

```

3. Purification: The hydrogen fluoride gas is purified by removing impurities like water and other acidic gases.

4. Electrolysis: The purified hydrogen fluoride gas is then electrolyzed in a cell with a special electrolyte, usually potassium bifluoride (KHF2), at high temperatures. This process separates fluorine gas (F2) from the hydrogen fluoride:

```

2HF → H2 + F2

```

The fluorine gas produced is highly reactive and dangerous, requiring careful handling and storage.