siegenite

[After Siegen, Pru ia, where found; suff- ite ( Min.).] Min.: A variety of Linnæite (q. v.), in which a part of the cobalt is replaced by nickel. si'-en-ite, . [SYENITE, .] SI-en-na, s . [See def.] 1. Geog.: A city of Central Italy, thirty-one miles southeast of Florence. 2. Art : A pigment made of terra di Sienna (Sienna earth), a compound of iron oxide and earthy matter. Sienna is of two kinds, raw and burnt, the latter being simply the earth exposed to red heat, so as to make it take up more oxygen. Sienna-earth, s . [SIENNA, 8.]