C H 



[88] 



C H 



covered by Scheele in 1774. It 

 is not permanent over water, which 

 absorbs twice its volume. Specific 

 gravity 2-47, 100 cubic inches 

 weighing 75 '67 grains. United 

 with an equal volume of hydrogen 

 gas it gives two volumes of hydro- 

 chloric or muriatic acid. In 

 nature, chlorine exists most abun- 

 dantly in chloride of sodium or 

 common salt. Its equivalent num- 

 ber is 35-42; its symbol Cl. 

 Chlorine has never been decomposed. 



CHLO'RITE (from %Aw/>o9, green, Gr.) 

 A. mineral, consisting of silica, 

 27-43, alumina 17-9, lime 0-50, 

 oxide of iron 30-63, magnesia 

 14'56, potash 1-56, water 6*92. 

 It is a dark green variety of talc ; 

 has a glistening lustre; minutely 

 foliated structure ; is soft and 

 unctuous to the feel; and has 

 obtained its name from its colour. 

 There are several varieties of talc 

 having a dark green colour, and 

 these are known as compact chlorite, 

 earthy chlorite, chlorite slate, foli- 

 ated chlorite, &c. Chlorite and 

 talc pass by insensible gradations 

 into each other, and in this state 

 they supply the place of mica, in 

 most of the granitic rocks in the 

 vicinity of Mont Blanc. 



CHLORITE ROCK. A name proposed, 

 by Dr. Boase, to be given to a 

 genus of rocks found in Cornwall. 

 The term is synonymous with 

 Chlorolite, which see. 



CHLO'RITE-SCHIST. A metamorphic 

 rock, of a green slaty character, 

 abounding with chlorite. 



CHLORI'TIC - SAND. Sand coloured 

 green by an admixture of chlorite. 

 Lyell. 



CHLOBI'TIC GRANITE. Granite con- 

 taining particles of chlorite. 



CHLOROLITE. (from %Xto/>o9, green, 

 and X$os, a stone, Gr.) A com- 

 pound of granular compact-felspar 

 and a mineral resembling chlorite. 

 Three species are enumerated by 

 Dr. Boase, namely, compact, lamel- 



lar, and schistose chlorolite. Chlo- 

 rolite abounds in quartz veins 

 containing compact and crystalline 

 chlorite, and which are often very 

 rich in metallic minerals, particu- 

 larly in copper ores. Chlorolite is 

 found in Cornwall and is a primary 

 rock. 



CHLOROPHGEITE. A mineral discover- 

 ed by Dr. Me Culloch. It was 

 found imbedded in the amydaloids 

 of the cliffs of Scuirmore in the 

 Isle of Rum, and has since been 

 brought from Iceland. 



CHCEROPOTAMUS. j The name assigned 



CHEROPOTAMUS. ) by Cuvier to a 

 genus of fossil quadrupeds of the 

 hog tribe, the earliest, according to 

 Professor Owen, of this tribe intro- 

 duced upon our planet. This qua- 

 druped, says Owen, must have 

 resembled the Peccari, but was 

 about one- third larger. The only 

 locality in Great Britain where any 

 portion of the Chceropotamus has 

 been discovered is in the Isle of 

 Wight, in the eocene limestone, a 

 locality corresponding with the 

 Paris basin in mineral character, as 

 well as in date of origin. 



CHO'ANITE. A zoophyte of the chalk 

 formation, intermediate between 

 Alcyonia and Yentriculites. Dr. 

 Mantell, in his " 4 Wonders of 

 Geology," states, " the choanite, 

 called petrified sea-anemone by 

 lapidaries, bears a close resemblance 

 to the recent Alcyonia. In the 

 choanite, crucial spines, resembling 

 those in the recent Alcyonia, may 

 be detected. The choanite is of a 

 sub-cylindrical form, with root- like 

 processes, and having a cavity or 

 sac, which is deep and small in 

 comparison to the bulk of the 

 animal The inner surface is stud- 

 ded with pores, which are the 

 terminal openings of tubes, disposed 

 in a radiating manner, and ramify- 

 ing through the mass." The beau- 

 tiful pebbles found on the shores 

 of Bognor and Worthing owe their 



