Question

# The most common minerals of phosphorus are

- Hydroxy apatite and kernite
- Colemanite and fluoraptite
- Borax and fluoraptite
- Hydroxy apatite and fluorapatile

## The correct answer is: Hydroxy apatite and fluorapatile

### Phosphorus minerals is called as hydroxy apatite and fluorapatite

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If the unit vectors and are inclined at an angle such that , then lies in the interval

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For an interval, square bracket denotes close bracket and parantheses means open bracket. Close bracket means that point is included in the interval. Opem bracket means the point is not included in the interval.