helvin, -ine Min.
(ˈhɛlvɪn)
[mod. (Werner, 1817) f. L. helvus light bay + -in.]
A honey-yellow or greenish silicate of glucinum and manganese, occurring in regular tetrahedral crystals.
| 1818 T. Thomson Ann. Philos. XII. 311 Helvin..was discovered in..Saxony. 1849 J. Nicol Min. 234 Helvine occurs at Schwarzenberg..in beds in gneiss. 1865–72 Watts Dict. Chem. III. 141 Helvin affords the only known example of a native compound of a silicate with a sulphide. |