Cryptic crossword clue
Minerals lads regularly put in iron boxes 9

The most common and most likely answer to this crossword clue is the 9 letter word FELDSPARS

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Minerals/Minerals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case minerals/minerals = feldspars.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FELDSPARS mean?

FELDSPARS noun
  1. Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.

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