CHR 



CHR 



sapphires : it is sometimes cut for ring 

 stones, and is usually set with yellow foil, 

 but is seldom to be met with even in the 

 possession of jewellers : it is called the 

 Oriental chrysolite, in commerce : con- 

 stituent parts 



Alumina - - - 

 Silica - - - - 

 Lime - - - - 

 Oxide of Iron 

 Loss .... 



- fl.5 



- 18.0 



- 6.0 



- 1.5 



- 3.0 



100. 



CHRYSOCOMA, in botany, English 

 goldy locks, a genus of the Syngenesia Po- 

 lygamia JEqualis class and order. Natural 

 order of Composite Discoidex. Corymbi- 

 ferae, Jussieu. Essential character : ca- 

 lyx hemispherical, imbricate ; style 

 scarcely longer than the florets , pappus 

 simple ; receptacle naked. There are 

 thirteen species : almost all of them na- 

 tives of the Cape of Good Hope. 



CHRYSOGONUM, in botany, a genus of 

 the Syngenesia Polygpamia Necessaria 

 class and order. Natural order of Com- 

 positse Oppositifolise. Corymbiferae, Jus- 

 sieu. Essential character : calyx five- 

 leaved; seeds involved in a four-leaved 

 calycle ; pappus one-leafed, three-tooth- 

 ed ; receptacle chaffy. There is but one 

 species ; viz. C. virginianum, a native of 

 Virginia. 



CHRYSOLITE, in mineralogy, a spe- 

 cies of the flint genus; the chief colour 

 of which is pistachio green, of all degrees 

 of intensity : it occurs sometimes in ori- 

 ginal, angular, pretty sharp-edged pieces, 

 which are frequently notched, and exhi- 

 bit a peculiar, rough, scaly, splintery sur- 

 face ; also in rolled pieces, and crystal- 

 lized ; brittle ; eusy frangible ; specific 

 gravity about 3.4; infusible before the 

 blow-pipe without addition ; constituent 

 parts, according to Klaproth, 



Silica 38.0 



Magnesia .... 39.5 

 Oxide of iron - - 19.0 

 Loss 3.5 



100.0 



It is found principally in Upper Egypt ; 

 but has been met with in Bohemia, and 

 in the isle of Bourbon. It is employed as 

 a precious stone in different kinds of 

 jewelry, but of no very great value. 

 'Werner thinks that the stone described 

 by the ancients under the name of yellow 

 chrysolite answers to our topaz. 



CHRYSOMELA, in natural history, a 

 genus of insects of the order of Coleoptera. 

 Antennae moniliform ; six feelers, grow- 

 ing larger towards the end ; thorax mar- 

 ginate ; shells irnmurgmate ; body most- 

 ly oval. Of this genus there are several 

 hundred species. They are separated 

 into three distinct divisions. A. lip en- 

 tire; hind legs equal. B. oblong; lip 

 bifid ; hind thighs equal. C oblong; lip 

 bifid; hind thighs thickened. This nu- 

 merous and very beautiful tribe is found 

 every where in woods and gardens. Their 

 motion is slow, and some of them when 

 caught emit an oily liquor of a disagree- 

 able smell. The larvae of this genus, and 

 also of the Cryptocephalus, feed on the 

 leaves of trees and plants. 



CHRYSOPHRAS,in mineral ogy,ft}pe- 

 cies of the Flint genus, of an apple-green, 

 of all degrees of intensity, passing through 

 the various shades of greenish grey. It 

 is found massive in angular pieces, and 

 thick plates. Internally it is dull ; some 

 rare varieties are glimmering. Specific 

 gravity 3.25. Before the blow-pipe it 

 loses its colour and transparency, and is 

 infusible without some addition. By ana- 

 lysis it is found to contain 



Silica . . . 

 Lime . . . 

 Oxide of nickel 



96.16 

 0.83 

 1.00 



97.99 



A trace of alumina and oxide of iron. 

 It is found with quartz, opal, chalcedony, 

 &c. in serpentine, in Lower Silesia. It is 

 chiefly used for I'ing-stones ; but is diffi- 

 cult to cut and polish. The apple-green 

 variety is the most highly valued, and 

 ring-stones of that colour will fetch 10, 

 or 12L It passes into horn-stone and chal- 

 cedony, and into a fossil which is inter- 

 mediate between chrysophras and opal. 

 It loses much of its colour when kept In 

 a warm and dry place, or when much ex- 

 posed to the air. Very elegant speci- 

 mens of this beautiful fossil are to be seen 

 in the great cathedral at Prague, where 

 a closet is inlaid with it. 



CHRYSOPHYLLUM, in botany, a ge- 

 nus of the Pentandria Monogynia class 

 and order. Natural order of Dumosze. 

 Sapotae, Jussieu. Essential character : 

 corolla bell-shaped, ten-cleft ; segments 

 alternate, spreading ; berry ten-seeded. 

 There are six species ; natives of the 

 West Indies. 



CHRYSOSPLENIUM, in botany, a ge- 

 nus of the Decandria Digynia class and 



