Cryptic crossword clue
Regularly grout slab with mineral 6

The most common and most likely answer to this crossword clue is the 6 letter word RUTILE

R
U
T
I
L
E

Buddy explains!

The straight part
We know that "mineral" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mineral = rutile.
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 RUTILE mean?

RUTILE noun
  1. The most frequent of the three polymorphs of titanium dioxide, crystalizing in the tetragonal system, TiO2.

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