Crossword Genius

Constituent of bones (7)

Ross

I believe the answer is:

calcium

(Other definitions for calcium that I've seen before include "White metallic element in limestone, chalk" , "Bone constituent" , "White metallic element found in most animals and plants, Ca" , "Metallic element present in limestone" , "Element, component of bones and teeth" .)

I've seen this clue in The Telegraph and The Independent.
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