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Apatite
Chemical Composition A family of phosphates containing calcium, iron, chlorine, and several other elements in varying quantities. The most common variety contains fluorine, and fluorapatite.
Colour Very wide color range.
Refractive Index R.I 1.60-1.67.
Durability Hardness 5. Brittle.
Crystal Structure Hexagonal
Specific Gravity 3.10-3.35.
Sources / Occurrence Widely distributed, but Mexico is the major source, especially of yellow apatite.
Varieties Cat’s eye Apatite.