Sunday Gk 1209

[Aquagility]

18a. Mineral able to act as a cation exchanger (7). ?E?L?T?
Realgtr has been suggested, but Chambers don't have it and Google can't find it. Any ideas?

[fiction-factory]

REALGTR

[dannyk13]

18a.Zeolite

[cupid04]

zeolite

[fiction-factory]

https://en.wikipedia.org/wiki/Realgar also fits the pattern

[dannyk13]

http://www.iza-online.org/synthesis/VS_2ndEd/IonExchange.htm

[dannyk13]

FF It is Zeolite.

[fiction-factory]

I got the obscure word REALGTR (which doesn't seem to exist elsewhere) from a couple of crossword sites just by typing the clue and no pattern.
Odd.

http://www.danword.com/crossword/Mineral_able_to_act_as_a_cation_exchanger

[Aquagility]

Thanks to you all. I found realgtr just as FF did, but I'm much happier with Zeolite.