Fluoroapatite is represented by the formula

Options

A. `CaF_(2)`
B. `Na_(3) AlF_(6)`
C. `Ca_(3)(PO_(4))_(2)`
D. `3Ca_(3)(PO_(4))_(2)*CaF_(2)`

Answer

To determine the formula for fluoroapatite, we will analyze the given options step by step.

### Step 1: Understand the Composition of Fluoroapatite
Fluoroapatite is a mineral that is primarily composed of calcium, phosphate, and fluoride ions. It is often referred to as calcium fluorophosphate.

### Step 2: Analyze the Given Options
We have four options to consider:
- Option A: CaF2
- Option B: Na3AlF6
- Option C: Ca3(PO4)2
- Option D: 3Ca3(PO4)2·CaF2

### Step 3: Identify the Correct Formula
Fluoroapatite is known to have the formula 3Ca3(PO4)2·CaF2. This indicates that it contains three units of calcium phosphate (Ca3(PO4)2) and one unit of calcium fluoride (CaF2).

### Step 4: Compare with the Options
- **Option A (CaF2)**: This is just calcium fluoride, not fluoroapatite.
- **Option B (Na3AlF6)**: This is cryolite, not related to fluoroapatite.
- **Option C (Ca3(PO4)2)**: This is calcium phosphate, but it does not include fluoride.
- **Option D (3Ca3(PO4)2·CaF2)**: This matches the known formula for fluoroapatite.

### Conclusion
The correct formula for fluoroapatite is given by **Option D: 3Ca3(PO4)2·CaF2**.

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