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apatite
(redirected from phosphorite)

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apatite

Common calcium phosphate mineral, Ca5(PO4)3(F,OH,Cl). Apatite has a hexagonal structure and occurs widely in igneous rocks, such as pegmatite, and in contact metamorphic rocks, such as marbles. It is used in the manufacture of fertilizer and as a source of phosphorus. Carbonate hydroxylapatite, Ca5(PO4,CO3)3(OH)2, is the chief constituent of tooth enamel and, together with other related phosphate minerals, is the inorganic constituent of bone. Apatite ranks 5 on the Mohs scale of hardness.
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Their topics include Lower Cambrian shelled phosphorites from the northern Montaigne Noire in France, Siluro-Devonian alpine reefs and pavements, a late Atokan regional encrinite in the Sierra Agua Verde in northwestern Mexico, and whether the distribution of tabulae in tabulates can be used to estimate palaeo-environmental changes.
Palaeozoic reefs and bioaccumulations; climatic and evolutionary ... by SciTech Book News
[FIGURE 6 OMITTED] Backfilling Previous experience with backfilling of oil shale mines and phosphorite mines allows one to consider that there is the possibility of using ash from powerplants, oil shale separation waste rock and/or limestone--as siderock from selective mining for perfoming backfilling [1, 9].
Future of oil shale mining technology in Estonia by Karu, V.; Vastrik, A.; Anepaio, A.; Vaizene, V.; Adamson, A.; Valgma, I. / Oil Shale
Uraniferous phosphorite and apatite-bearing gneisses in the Proterozoic Finland.
Uranium exploration, non-governmental organizations, and local ... by Eerola, Toni / Estonian Journal of Earth Sciences
 
 
 
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