Black Lives Matter co-founder Tometi (4)

I think it could be either:

Which length description are you looking for?:

opal

(Other definitions for opal that I've seen before include "Lustrous stone" , "Opaque mineral used a gemstone" , "Milk-coloured gemstone" , "Semi-precious stone of b;uish white colour" , "Milky white gemstone" .)

I've seen this clue in the USA Today and the Universal.

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