suure fosforisisaldusega (5-35% P?O?), enamasti merelise, harva mandrilise tekkega settekivim, mille fosfaatne aine koosneb peeneteralistest apatiidirühma mineraalidest (hrl. fluorkarbonaatapatiidist) ning sisaldab lisandeina kvartsi, kaltsiiti, dolomiiti, glaukoniiti, limoniiti, püriiti, savi- jt. mineraale ning orgaanilist ainet. ... F. on f-ijahu ning fosfor- ja liitväetiste lähteaine. ... Vaesemad maagid rikastatakse, saamaks keemiatööstuse nõuetele vastavat f-ikontsentraati (see peab sisaldama olenevalt töötlemismeetodist vähemalt 24-28% P?O?).
rock that contains one or more phosphatic minerals of sufficient purity and quantity to permit its commercial use as a source of phosphatic compounds or elemental phosphorus
sedimentär bergart som domineras av mikrokristallina fosfatmineral, främst apatit
About 90% of the world's production is sedimentary phosphate rock, or phosphorite; the remainder is igneous rock rich in apatite. The term "phosphate rock" serves both industry and the geological fraternity, but with different meanings. In the industry, "phosphate rock" is usually a high grade phosphate product that can be used in a fertilizer plant or put directly on cropland, it is usually beneficiated ore. ... The geological "phosphate rock" is a rock that contains one or more phosphate minerals, usually apatite, in sufficient quantity to be of interest (either directly or after beneficiation) in the manufacture of phosphate products.
