单词	phosphorite
释义	phosphorite /ˈfɒsfərʌɪt / noun [mass noun] A sedimentary rock containing a high proportion of calcium phosphate.Under such conditions biogenic carbonate may be replaced by phosphorite (as off the coast of South Africa beneath the Benguela Current).... The late Neoproterozoic Doushantuo Formation in South China contains several exceptionally preserved biotas in its cherts, phosphorites, and black shales. Fossiliferous, thin marine shales, associated with biochemical precipitates such as glauconite and phosphorite, are common in transgressive systems tracts. Origin Late 18th century: from phosphorus + -ite1.
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