| 31. | One such mineral that is useful is apatite.
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| 32. | Turquoise may also pseudomorphously replace feldspar, apatite, other minerals, or even fossils.
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| 33. | John Weber and his associates presented fission track dating of apatite from this impact structure.
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| 34. | The accessory minerals of these rocks are principally oligoclase, muscovite, apatite and zircon.
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| 35. | In the west of the town slate enriched by apatite and zircon can be found.
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| 36. | Initially, phosphate weathers from rocks and minerals, the most common mineral being apatite.
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| 37. | It is a member of the apatite group, and forms a series with hydroxylellestadite.
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| 38. | Portnoy was keen to find something more unusual, a tourmaline or perhaps some green apatite.
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| 39. | Citrate is a vital component of bone, helping to regulate the size of apatite crystals.
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| 40. | Apatite is one of a few minerals produced and used by biological micro-environmental systems.
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