The Trinidad de Guedes field, in Matanzas, offers the greatest prospects for the production of fertilizers, as it presents areas of clayey granular phosphorites
are of pelletal type and commonly contain cellophane, dahlite, francolite, glaucophane, dolomite, iron oxide and pyrite in various proportions.
Most provide the existing mining complexes with a long perspective; but they require re-organisation in extracting the most important minerals such as gold, uranium, copper, lead, silver, lithium, phosphorites
, potassium salts, fluor-spar, wollastonite, agrochemical ores, and others.
Rare earth elements and sulfur and strontium isotopes of Upper Cretaceous phosphorites
However, even more spectacular within the Doushantuo phosphorites
is the preservation of metazoan eggs and early embryos.
Stoichiometric norm of phosphoric acid for the decomposition of each of the five types of Central Kyzylkum's phosphorites
is calculated out of the equation:
Co-author Richard Wirth of the GFZ German Research Centre for Geosciences, who analyzed the rock samples with an electron microscope, said that the formation of Earth's earliest phosphorites
was influenced strongly, if not controlled completely, by the activity of sulfur bacteria.
c) In deposits, the U content of phosphorites
directly correlates with [P.
Pufahl discusses the manner in which phosphorus is concentrated in insular, seamount, and continental margin phosphorites
, and compares phosphorites
in upwelling vs.
The mineral Xenotime (YPO4) is usually associated with phosphorites
The dam gave way after failing to withstand the pressure of waste from the treatment of apatites and phosphorites
with sulfuric acid.
Evidence of giant sulphur bacteria in Neoproterozoic phosphorites