S42 SELENIUM. 



Gloucestershire, in Lias. Aust Passage 

 and Pyle Hill, near Bristol ; and at Penarth 

 and Cardiff, Glamorganshire. Cheshire, 

 Alston Moor, Cumberland, Jig. 378. Near 

 Pollistone, in Kent, in gault. Epworth, in 

 Lincolnshire. Somerset. Warwickshire, 

 &c. &c. — Scotch. Banks of the Whit- 

 adder, Berwickshire, in red clay. Moffat, 

 Dumfries shire. Hurlet, near Glasgow. — 

 Irish. Kilroot, near Carrickfergus, co. An- 

 trim. Ulster. — Foreign. Salt mines of Bex, 

 in Switzerland. Hall, in the Tyrol. Sulphur 

 mines of Sicily. Near O^ana, in Spain. 

 Montmartre, near Paris. Near Lockport, in 

 New York ; Washington co., Virginia, and 

 in other parts of the United States. 



Name. From a-iX'/x/i, the moon, in allusion 

 to the reflection it gives of the moon, as in 

 a mirror ; or rather from the vulgar belief 

 formerly entertained in its being water con- 

 gealed by the influence of the moon. See 

 Gypsum. 



"The plates of this body were split, and 

 anciently employed for the lights of win- 

 dows, and when glass came afterwards to 

 be more commonlj^ made, and generally to 

 obtain, they cut it into rhomboidal planes, 

 in imitation of those plates, and framed 

 them together with lead." — J. Woodward, 

 1729. 



At Berenguela, in South America ; some 

 of the slabs of Alabaster quarried there are 

 said by David Forbes* to be so transparent 

 that tablets of it, until ver}^ lately, have 

 been in general use in that "part of Bolivia 

 as a substitute for window - glass. He 

 noticed that the windows of the church at 

 Pisacoma were formed of this material, in 

 slabs of about two inches thick. 



See Gypsum, Alabaster, Lapis Specu- 



LARIS. 



Brit. Mus., Case 54. 



31. P. G. Horse-shoe Case, Nos. 286 — 

 299. 



Selenium. See Native Selenium. 

 Selenium Sulphuk. See Selensul- 



PHUR. 



Seleniure d'Argent, Beudant. See 

 Naumannite. 



Seleniure de Cuivre 

 Jierzelius. 



Seleniuret of Copper 

 Phillips. 



Seleniuret of Lead, Phillips. See 

 Clausthalite. 



Seleniuret of Lead and Cobalt, 

 Phillips. See Tilkerodite. 



* Quarterly Journ. Geol. Soc. vol. xvii. p. 38. 



^0 s 



VBerz 



See 



RZELIAN- 

 ITE. 



SELENQUECKSILBERBLEL 



Seleniuret of Lead and Copper, 

 Phillips. See Senenbleikupfer and Se- 

 lenkupferblei. . 



Seleniuret of Lead and Mercury, 

 Phillips, See Lehrbachite and Selen- 

 quecksilberblel 



Seleniuret of Silver, Phillips. See 

 Naumannite. 



Seleniuret of Silver and Copper, 

 Phillips. See Eucairite. 



Selenkobaltblei. Selencobalt lead. 

 Clausthalite, in which cobalt replaces, part 

 of the lead. It is the Tilkerodite of Hai- 

 dinger, and the Zorgite (in part) of Brooke 

 & Miller. 



Selenkupfer. Selencopper. See Ber- 



ZELIANITE. 



Selenkupferblel Selen-copper-lead. 

 Occurs massive, of a paler lead-grey colour, 

 and with a fainter lustre, than selenide of 

 lead (^Clausthalite'). Often tarnished brass- 

 yellow or violet. H. 2 5. S.G. 6-96 to 7-04. 



Comp. Selenide of copper and lead, or 

 2PbSe + CuSe. 



Anahjsis, by H. Rose : 





Lead .... 



.59-67 



Copper. 



. 7-86 



Selenium 



. 29-96 



Iron .... 



. 0-33 



Iron and lead 



. 0-44 



Undecomposed ore 



. 1-00 



99-26 



Localities. Tilkerode and Zorge, in the 

 Harz, associated with Clausthalite. Glas- 

 bachgrund, in Thuringia. 



Selenbleikupfer and Selenkupferblel are 

 the names given to varieties of Clausthal- 

 ite, in Avhich a portion of the lead is re- 

 placed by copper. These have been called 

 Raphanosmite by von Kobell, and Zorgite 

 by Brooke & Miller. 



Selenkupfersilber, v. Leonhard. Se- 

 len-copper-silver. See Eucairite. 



Selenmercuk. Selenide of Mercury. See 

 Onofrite. 



Selenpalladite, Zinken. Native Pal- 

 ladium, occurring in small, bright, hexago- 

 nal tables, of a pale steel-grey colour, at 

 Tilkerode, in the Harz. 



Selenquecksilbbr. Selenide of Mer- 

 cury. See Onofrite. 



SelenquecivSILBerblei. a mechanical 

 mixture of Clausthalite and Selenide of 

 Mercurv, having the structure and colour 

 of the former. S.G. 7-3. 



Localities. Tilkerode and Lehrbach, in 

 the Harz. 



