Cryptic crossword clue
Mineral? You’d need firmness of character to have litre 6

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

S
P
I
N
E
L

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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 SPINEL mean?

SPINEL noun
  1. Any of several hard minerals of cubic symmetry that are mixed oxides of magnesium and aluminium and are used as gemstones of various colours.
  2. Any crystalline material, not necessarily an oxide, that possesses the same crystal structure as this mineral.
  3. Bleached yarn in making the linen tape called inkle; unwrought inkle.

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