phosphorite

[fos-fuh-rahyt]
noun
a sedimentary rock sufficiently rich in phosphate minerals to be used as a source of phosphorus for fertilizers.

Origin:
1790–1800; phosphor- + -ite1

phosphoritic [fos-fuh-rit-ik] , adjective
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World English Dictionary
phosphorite (ˈfɒsfəˌraɪt)
 
n
1.  a fibrous variety of the mineral apatite
2.  any of various mineral deposits that consist mainly of calcium phosphate
 
phosphoritic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Uppermost part commonly contains abundant phosphorite.
Does not include sediment from phosphorite rich areas.
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