chamoisiten.

/ˈʃamwəzʌɪt/Etymology: Named 1820 < Chamoison, in the Valais, where first found.
1832 C. U. Shepard 123 Chamoisite appears to be an impure variety.
1868 J. D. Dana (ed. 5) 511.
This entry has not yet been fully updated (first published 1889; most recently modified version published online March 2022).