"stable"@en . . . . "PHSD"@en . "Phosphate-sediment"@en . . . "Phosphate-sediment"@en . . "Phosphate-sediment - In the Rock Classification Scheme, all phosphate-sediments are given this group name. This is the unlithified equivalent of phosphorite. British Geological Survey Research Report RR/99/03, section 4.1 and fig. 8."@en . .