CHRYSOBERYL. 

 Analysts from the Ural, by Awdejew , 



Alumina 



. 78-92 



Glucina 



. 18-02 



Protoxide of iron 



. 3-12 



Oxide of chrome . 



. 0-36 



Oxides of copper and lead 



. 0-29 



100-71 



Analysis from Haddam, Conn., U. S., by 

 Damour : 



Alumina .... 76-02 

 Glucina .... 1841 

 Protoxide of iron . . 4-61 

 Quartz 0-49 



99-43 



Localities. Irish. — Mourne Mountains, in 

 granite. Forei^n.—Brnzd and Ceylon,, in 

 rolled pebbles in the alluvitil deposits of 

 rivers. The Ural (^Alexandrite) ; j\Iarchens- 

 dorf, in Moravia. Haddam, Connecticut; 

 and at Greenfield, near [Saratoga, New 

 York, U.S. 



Though not much worn in jewelry, the 

 Chrj'soberyl, when transparent and of suf- 

 ficient size to be cut in facets, forms a beau- 

 tiful yellov.'ish - green stune, which may 

 almost vie with the yellow diamond in 

 lustre, polish, and colour. It is,, however, 

 very difficult to work. The finest stones, 

 if sufficiently deep, should be cut in pa- 

 vilion facets, like a brilliant, and be made 

 into rings, necklaces, &c., with or without 

 diamonds. The smaller stones appear to 

 the greatest advantage set round highly 

 coloured gems, in circular ear-drops, &c. 

 The thinner specimens should be cut in 

 delicate steps. 



The name Cymophane is applied to those 

 semi-transparent varieties which exhibit a 

 peculiar bluish-white or milky opalescence 

 floating in the interior of the stone. These 

 Opalescent Chrysolites (as they are some- 

 times termed), though less prized by jewel- 

 lers than the more transparent varieties, 

 often possess a very good colour, and when 

 cut en cabocJion make beautiful ring-stones. 

 Chrysoberyl raaj^ be distinguished from 

 Chrysolite, Moonstone, and opalescent 

 Quartz (Cat's-eye) by its superior hardness, 

 and from yellow Topaz by not being ren- 

 dered electric by heat. 



The name Chrysoberyl is derived from 

 Xi'Jfo?, golden, fiM'-'>-'M^, heryl ; Cymophane from 

 ^y^otj a wave, and ip«''i'^, to appear, in allusion 

 to its floating light. 



The Chrysoberyl of the ancients was a 

 dift'erent stone, probably the Chrysoprase of 

 the moderns. 



CHRYSOLITE. 83 



Brit. Mus., Case 19. 



M. P. G. Horse-shoe Case, 859 to 864. 



Chkysocolla, Phillips, Haidinger. Oc- 

 curs kidney-shaped, globular, stalactitic, 

 massive, but oftener investing Malachite and 

 other ores of copper. Colour verdigris- and 

 emerald-green, passing into sky-blue, and 

 inclining to brown when imptire. Lustre 

 resinous, shining or dull. Opaque or slightly 

 transparent. Streak white. . Practure small 

 conchoidal. H, very variable, 2 to 3. S.G. 

 2-2. 



Comp. Cu Si + 2H, or oxide of copper 44-94, 

 silica o4-83, water 20-23 = 100-00, oftener 

 mixed with carbonate and oxide of copper. 

 Analysis from Chili, by Kittridge : 



Silica 40-09 



Oxide of copper . . . 27-97 

 Protoxide of iron . . . 4*94 



Lime 1-49 



Magnesia .... 0-78 

 Water 24-73 



100-00 



B3 on charcoal does not fuse, but blacken.s 

 in the outer and reddens in the inner flame. 

 With borax melts to a green glassy globule, 

 and is partly reduced. Soluble in muriatic 

 acid, with separation of gelatinous silica. 



Localities. English. — Cornwall ; near the 

 Lizard, in serpentine, associated with Na- 

 tive Copper. Cumberland. Westmoreland. 

 Brada Head Mines, in the Isle of Man. 

 iScoteA. — Leadhills, in Lanarkshire. L-ish. 

 — Knockmahon Mines; Audley Mine, co. 

 Cork. Foreign. — The Kupferhiigel, near 

 Kupferberg, in Bohemia, Spitz, in Austriii. 

 Libethen and Herrngrund, in Hungary. 

 The Bannat. Ober and Nieder-Rochlitz, 

 in Transylvania, in crj stalline slates. Fal- 

 kenstein and Schwatz, in the Tyrol. Saxony. 

 Andreasberg, in the Harz. Siberia. Chili. 

 South Australia, &.c. 



Name. From xi'-^^°?, gold, and y^oXXo-,, glue. 



ChrysocoUa may be distinguished from 

 Malachite by colour, conchoidal fracture, 

 transparency, as well as by its very slight 

 effervescence with acids. 



Brit. Mus., Case 26. 



M. P. G. Principal floor, Wall- case 2 

 (British). 



Chrysolite, Phillips. The name given 

 to the paler and more transparent crystals 

 of Olivine ; the latter name being restricted 

 to imbedded masses or grains of inferior 

 colour and clearness. Rhombic, Occurs 

 massive and compact, or granular, usually 

 in imbedded grains. Colour greenish-yel- 

 low. Lustre brilliantlv vitreous. Streak 

 G 2 



