CEYLANTTE. 



at Cervantes in Spain: whence the name 

 Cervantite. 



Ceylanite, Jameson. An iron-and-mag- 

 nesia Spinel, named after the locality Cey- 

 lon. See Pleonaste. 



Ceylon Tourmaline. The name given 

 by lapidaries to Chrysolite from Ceylon. 



Ceylonese Garnet. See Bohemian 

 Garnet. 



Ceylonian Zircon. The name given by 

 jewellers to the fire-red, yellow, yellowish- 

 green and grey varieties. 



Chabacit, Hausmann, Haidinger. ChA- 

 BASIE, Haiiij, Phillips, Brooke §- 3Iiller. 

 Chabasin, Haidinger. Chabasit, Nau- 

 mann. v. Kobell, Rose. Chabasite, Base 

 d' Antic, Jameson, Nicol. Chabazite, Dana. 

 Hexagonal. Found crystallized in the form 

 of an obtuse rhombohedron. Colour white 

 or greyish, sometimes pale red superficially. 

 Lustre vitreous. Transparent, translucent. 

 Brittle ; fracture uneven. H. 4 to 4-5. S.G. 

 2-08 to 2-17. 



Fig. 97. 



Fig. 99. 



Fig. 100. 



Comp. _(Ca, Na, K) Si + 3A1 Si2 + 6H. 



Analysis from Faroe, by Berzelius: 

 Potash . . . .0-41 

 Soda ..... 2-75 



Lime 8-35 



Magnesia . . . .0-40 

 Alumina . . . .20-00 

 Silica ..... 48 00 

 Water 19-30 



99-21 

 BB shrinks up and fuses easily to a blis- 

 tered slightly translucent white enamel. 

 Soluble in the state of powder in muriatic 

 acid. 



Chabazite is met with in fissures and 

 cavities of some basaltic rocks, or within 

 geodes of Quartz and Agate disseminated in 

 those rocks. 



CHALCEDONY. 71 



Localities. In large and very beautiful 

 crystals in the amygdaloids of Faroe, Ice- 

 land and Greenland, often associated with 

 Stilbite and Green Earth. The Giant's 

 Causeway, in Basalt ; Portrush, in fine trans- 

 parent crystals. — Scotch. In Trap at Kil- 

 malcolm ; Grainger's Quarry, 2h miles S.W. 

 of Kilmalcolm ; Glen Farg in Fifeshire ; Eig 

 on the coast of Argyleshire ; the Islands of 

 Mull and Skye, &c. Splendid specimens 

 occur in a kind of Greenstone (tlie Grau- 

 stein of Werner) at Aiissig in Bohemia ; 

 Aunerode near Giessen, of a wine-yellow 

 colour; in Nova Scotia, associated with 

 Heulandite, Analcime, &c. Perfect and 

 well-defined crystals are also found at Plom- 

 bieres, deposited in cavities in the bricks 

 composing the ancient Roman channel 

 through which the thermal waters flow. 



Name. From xo^^^-^'^^^i the name of the 

 last of the twenty stones celebrated for their 

 virtues, and mentioned in the poem 7n(i >.Wc^v, 

 ascribed to Orpheus. 



Brit. Mus., Case 27. 



31. P. G. Horse-shoe Case, No. 1144. 



Chalcanthil, Glocker. (From %«^«6?, 

 copper, and av^a?, a flower'). See Cyanosite. 



Chalcedony. A variety of Quartz oc- 

 curring in mammillated and botryoidal 

 forms, and as Stalactites in cavities lined 

 or roofed with Chalcedony, but never in a 

 crystallized state. According to Fuchs, 

 Chalcedony is true Quartz with some Opal 

 disseminated through it. It is usually milk- 

 white, approaching more or less to smalt- 

 blue ; the latter varieties are the rarest and 

 most esteemed, and are called Sapphirine by 

 French lapidaries. Many varieties, espe- 

 cially^ oriental ones, are of a yellowish, in- 

 stead of a bluish colour, and are known in 

 commerce as Avhite Carnelians : the red and 

 brown varieties are called red Carnelians, 

 and the brown approaching to orange or 

 yellow are termed by the lapidaries Sard. 



Chalcedony is more or less semi-transpa- 

 rent, and often exhibits parallel or con- 

 centric bands or laminae of two or more 

 colours, Avhen it is called Agate. It equals 

 Quartz in hardness, and is not very easily 

 broken, but when broken it presents an 

 even fracture passing into finel}- splintery 

 and flat conchoidal, with little or no lustre. 



BB it becomes dead opaque white. 



Chalcedony from its hardness and tough- 

 ness forms an excellent material for the 

 engraver, by whom those varieties are pre- 

 ferred which are of a perfectly uniform tint, 

 unbroken by bands or stripes or other acci- 

 dental markings ; the last are better adapted 

 for small vases, brooches, &c. 

 r 4 



