thaumasiten.

/ˈθɔːməsʌɪt/Etymology: modern (Nordenskiöld, 1878), < Greek θαυμάσιος wonderful, marvellous + -ite suffix1: so named ‘on account of its unusual composition’.
Mineralogy.
1881 in H. Watts VIII. 1921.
This entry has not yet been fully updated (first published 1912; most recently modified version published online June 2018).