K A K 



242 ] 



K I I 



posed of silex and alumine; the 

 proportions are variable, but the 

 silex usually predominates. When 

 pure kaolin is employed in the 

 manufacture of porcelain, some in- 

 gredient must be added as a flux, as, 

 when pure, it is infusible. There 

 is satisfactory evidence that kaolin 

 has, in most cases, if not in all, 

 originated from the decomposition 

 of rocks abounding in felspar, more 

 particularly from graphic granite, 

 which consists almost entirely of 

 quartz and felspar. According to 

 "Werner, it is the carbonic acid 

 which has changed the felspar in 

 granite and gneiss into kaolin. The 

 quantity of kaolin, derived from 

 the felspar of decomposing granite, 

 shipped from Cornwall to Worces- 

 tershire for the china manufactories 

 amounted, in 1816, to 1775 tons. 

 Prof. Phillips gives the follow- 

 ing as the analysis of kaolin: "the 

 kaolin of China consists of silex 

 71-15, alumine 15-86, lime 1-92, 

 water 6*73; the kaolin of Cornwall 

 is composed of alumine 60 '00, silex 

 40-00 



KA'BPHOLITE. | (from ra/>0os, straw, 

 CA'BPHOLITE. j and \i0os, a stone, 

 Gr.) A straw-coloured mineral, 

 occurring in thin prismatic concre- 

 tions, and of a fibrous structure. 

 According to Stromeyer, it consists 

 of silica 36-15, alumina 28*60, pro- 

 toxide of iron 2-29, protoxide of 

 manganese 19*16, lime 0-27, flu- 

 oric acid 0-47, water 10-78. It is 

 found in the tin mines of Schlack- 

 enwald in Bohemia. 

 KEEL. (Kiel, Germ, quille, Fr. 



1 . In conchology, the longitudinal 

 prominence in the Argonautae. 



2. In botany, the term keel is ap- 

 plied to two of the petals in papi- 

 lionaceous flowers : the keel is 

 composed of two petals, separate or 

 united, and encloses the inter- 

 nal organs of fructification. 



3. In entomology, a sharp, longi- 

 tudinal, gradually rising elevation 

 upon the inferior surface. 



KEE'LED. Applied to leaves when the 

 back is very prominent longitudi- 

 nally. 



KELVE. In the south of Ireland, car- 

 bonaceous shale is called Kelve. 



KENTISH BAG. The name given to a 

 siliciferous limestone with dissemi- 

 nated dark green particles : it is 

 found in the lower green sand. 



KEBA'TOPHYTE. A name given to the 

 horny zoophyte. 



KEBATO'SA. One of the three orders into 

 which the class Poriphera has been 

 divided. The axis of the animal is en- 

 tirely composed of horny anastomos- 

 ing filaments, from which circum- 

 tance the name has been applied. 



KE'BS ANTON. A greenstone rock, com- 

 posed essentially of hornblende and 

 mica, in which some felspar is often 

 mixed. 



KE'BOLITE. An earthy mineral occur- 

 ing in Silesia and in Saxony, asso- 

 ciated with serpentine. According 

 to Pfaff, it contains silica 37'95, 

 alumina 12-18, magnesia 16-02, 

 water 31-00. It is of a white, 

 yellow, or green colour, and is 

 found in kidney shaped masses, 

 which have a lamellar or compound 

 structure. Feels greasy, but does 

 not adhere to the tongue. 



KE'UPEB. The name given by the 

 German geologists to one division 

 of rocks of the Triassic period. The 

 Marnes Irisees of the French. It 

 consists principally of red and green 

 marl. 



KI'LLAS. A provincial name for a 

 coarse argillaceous schist ; a variety 

 of slate. Mr. Bakewell, in men- 

 tioning the Icillas of Cornwall, says, 

 " perhaps the best designation of 

 the Icillas rock in this situation is, 

 that of a minutely grained and 

 highly indurated gneiss that had 

 lost its schistoze character." Mr. 

 Hawkins considers the common 

 Icillas, or slate of the mining dis- 

 trict, is an intimate mixture of 

 quartz, with mica, talc, chlorite, 

 and, perhaps, in some instances, 

 with felspar. Mohs saysthat Was 



