a group of phosphate minerals that includes ten mineral species and has the general formula x5(yo4)3z, where x is usually calcium or lead, y is phosphorus or arsenic, and z is chlorine, fluorine, or oh-.
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... on gem quality Durango fluorapatite which indicated a closure temperature of just 100 ? +/- 3O”C, a value recently confirmed on several additional apatites (Lippolt et al., 1994). The article is saying you should not find helium unless low temperatures are involved. Especially important being peak ...
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