Cotterite is the rarest variety on Earth of the most common mineral on Earth. Cotterite is a type of quartz that was only ever found in County Cork and that shows a unique trait. Instead of looking glassy, which is the lustre of all well-behaved quartz (e.g.amethyst, citrine, rock crystal, prase), cotterite displays a bizarre and distinctive silvery metallic sheen. Yet there is no metal! For quartz, as far as we currently know, this trait has only ever appeared once on Earth, in just one mineral vein, and found just once back in 1875 by a lady known for 137 years only as ‘Miss Cotter’ from Rockforest, after whom the mineral variety was named. Thistalk will explain this most weird-looking of quartzes and reveal not only who ‘Miss Cotter’ was but also who are her closest living relatives.
This pre-recorded talk wasbroadcast on YouTube on Friday, 18August2023, as part ofHeritageWeek 2023 programming. For the most up-to-date information about NMI - Natural History, inlcuding opening hours please visit 'Visitor Info'.
For more highlights about the collections at the Museum visit our online talk series 'Tales from the Decant'
