When was this clue last seen?

This clue last appeared in the NYT Crossword on Sunday, 27 March 2022.

Approximately 5.5 million tons of it was used to build [see circled letters]

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approximatelymillioncircled

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This clue appeared in the NYT Crossword on Sunday, 27 March 2022. The answer LIMESTONE is a 9-letter entry.

What is the answer to "Approximately 5.5 million tons of it was used to build [see circled letters]"?: LIMESTONE
How many letters is the answer to "Approximately 5.5 million tons of it was used to build [see circled letters]"?: The answer has 9 letters.
When was this clue last seen?: This clue last appeared in the NYT Crossword crossword on Sunday, 27 March 2022.
Has this crossword clue appeared before?: This appears to be a rare or unique clue.

Looking for a 9-letter word for “Approximately 5.5 million tons of it was used to build [see circled letters]”?

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