carbonaceous ironstone
carbonaceous ironstone · carbonaceous ironstones
A dark, organic-rich sedimentary rock containing more than 15% iron and significant…A dark, organic-rich sedimentary rock containing more than 15% iron and significant amounts of plant matter or coallike material.
Meaning
1 senses(countable, uncountable)A dark, organic-rich sedimentary rock containing more than 15% iron and significant amounts of plant matter or coallike material.
Forms
plural: carbonaceous ironstones| Singular | carbonaceous ironstone |
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| Plural | carbonaceous ironstones |
regular
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable