What does the cryptic crossword clue "Black mineral providing the exterior for a great hall (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Black mineral providing the exterior for a great hall (8)

Times Cryptic #29321 | 16 Down | 2025-08-29

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I haven't cracked this one yet — but the brilliant team at Times for the Times have:

B (black) and SILICA (mineral) containing (providing the exterior for) A.

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