Simple Lithology

phosphorite

http://resource.geosciml.org/classifier/cgi/lithology/phosphorite

broader phosphate rich sedimentary material
narrower phosphorite
sedimentary rock
narrower phosphorite
definition Sedimentary rock in which at least 50 percent of the primary or recrystallized constituents are phosphate minerals. Most commonly occurs as a bedded primary or reworked secondary marine rock, composed of microcrystalline carbonate fluorapatite in the form of lamina, pellets, oolites and nodules, and skeletal, shell and bone fragments. more like this
source HallsworthandKnox 1999, Jackson 1997 more like this
type
Resource
Concept
in scheme simplelithology
is primary topic of phosphorite