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27a: Mineral with polarising properties - Mainly Black

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geonlor | 21:45 Mon 06th Jun 2011 | Crosswords
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I have: -o-r-a-i-e : Only 2 possibles = Tourmaline & Colemanite - but neither are Black : Help Please!
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according to Chambers tourmaline is black
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Opps : Sorry - I identified the "DT Herculis" in the title when posting but it didn't show on the question.
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Thanks Scotsman - much obliged : I Googled 'Tourmaline' but didn't see any reference to Black.
A good dictionary is better value than google
tourmaline is black, but it can also be transparent and used in making gems.

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27a: Mineral with polarising properties - Mainly Black

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