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Meadoway | 09:19 Mon 06th Jun 2011 | Crosswords
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ornamental section of cloth sewn into a garment

I have i?s?e?

That is assuming colemanite is correct for 27 Across Mineral with polarising properties typically black ?o?e?a?i?e

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20d insert 27a Tourmaline
insert
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Thank you JWLSWANN AND EUPHEMIA
Insert is the answer, the mineral is not colemanite but tourmanite.
Cheers,
Jerry
Search ResultsPolarizer - Wikipedia, the free encyclopedia
A polarizing filter cuts down the reflections (top) and made it possible to ... The best known crystal of this type is tourmaline. ... Other linear polarizers exploit the birefringent properties of crystals such as quartz and calcite. ...
en.wikipedia.org/wiki/Polarizer -

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