KERASIN. 



Insoluble in nitric acid or water. 



Localities. Cornwall (rarely), at Huel 

 Duchy, Huel St. Vincent, Huel Mexico, 

 Silver Valley, and Huel Brothers. — Foreign. 

 The largest masses, especially those of a 

 green colour, are brought from Chili, Peru, 

 and Mexico, where it accompanies Native 

 Silver. It also occurs at Huelgoet, in 

 Brittany; Markirchen, in Alsace; Kongs- 

 berg, in Norway; Schemnitz, in Hungary; 

 Schlangenberg, in the district of Koliwan, 

 in Siberia, &c. 



This mineral occurs in clay-slate, always 

 in veins, and chiefly in their upper part. 

 It is associated with other ores of silver, and 

 sometimes with ochreous Brown Iron-ore, 

 Quartz, Heavy Spar, ores of copper, &c. 



The name 'Kerargyrite, or Horn Silver 

 (derived from «£§«?, Aorn, and a-^yvoov, silver), 

 appears to have reference to its property of 

 cutting like horn. 



This ore, especially the conchoidal sub- 

 species, has an icy or glassy appearance, «n 

 which account it was called vitreous or 

 glass]/ silver -ore by the older mineralogists. 

 The vitreous silver-ore of Kirwan and 

 others is Silver Glance. 



Brit. Mus., Case 59. 



M. P. G. Principal Floor, Wall-cases 14 

 (British) ; 22 (Foreign). 



Kerasin. The name given by Von Ko- 

 bell to Cromfordite, and by Beudant to 

 Mendipite. 



Kerate, Haidinger, Nicol, Greg §- Lett- 

 som. Hornsilver. See Kerargykite. 



Keratophyllite, Beudant. See AcTi- 



NOTE. 



Kermes, Brooke §- Ililler ; Kermesite, 

 Dana; Kermesome, Chapman. Oblique: 

 primary form an oblique rhombic prism. 

 Usually occurs in tufts of capillary crystals, 

 consisting of elongated, slender, six-sided 

 prisms, the surfaces of which are striated 

 longitudinally. Colour cherry-red. Slightly 

 translucent, appearing scarlet by trans- 

 mitted light. Lustre adamantine. Streak 

 brownish-red. Sectile. Slightlv flexible in 

 thin laminae. H. 1 to 1-5. S.G.' 4-5 to 4'6. 



Comp. Oxy-sulphide of antimony, or Sb 

 + 2Sb S5 = oxideof antimony 69'82, sulphide 

 of antimony 30*18 = antimony 76'33, sulphur 

 18-93, oxygen 4-74=100. 



Analysis, by H. Rose ■* 

 Antimony .. . . . 74-45 

 Sulphur .... 20-49 

 Oxygen .... 5-29 



100-23 



KIDNEY-STONES. 



201 



BB fuses very readily, sinking into the 

 pores of the charcoal, and volatilizing in 

 dense clouds. Becomes covered with a 

 white coating Avhen immersed in nitric 

 acid. 



Localities.— British. New Cumnock, Ayr- 

 shire, in capillary fibres, with Grey Anti- 

 mony. — Foreign. Malaczka, near Posing, in 

 Hungary, in veins with Quartz and Grey 

 and White Antimony. Braunsdorf, near 

 Freybei'g, in Saxony. Allemont, in Dau- 

 phine'. 



Kermesite results from the decomposition 

 of Grey Antimony. 



Brit"! Mus., Case 38. 



Kerolite, Breithaupt. Is found in kid- 

 ney-shaped masses, which have a lamellar 

 or compact structure, and a white, yellow, 

 or green colour. Lustre vitreous or resinous. 

 Transparent or translucent at the edges. 

 Feels greasy, but does not adhere to the 

 tongue. Streak Avhite. Fracture conchoi- 

 dal. H. 2 to 2-5. S.G. 2 to 2-4. 



Comp. Sesquihydrate of silicate of mag- 

 nesia, or 2Mg Si + 3H. 



Analysis, from Zoblitz, by Kilhji ; 



Silica 46-96 



Magnesia . . . .31-26 

 Water 21-22 



99-44 

 BB becomes black, but does not fuse. 

 Localities. Zoblitz, in Saxony, and Fran- 

 kenstein, in Silesia, associated with Serpen- 

 tine. 



Name. From ^--j^o?, tvax, and >.iQo;^ stone. 

 Brit. Mus., Case 25. 



Kevil. a Derbyshire mining term for a 

 sparry substance found in the vehi and com- 

 posed of Calc-spar, Fluor, and Barytes. 



KiBDELOPHAN, Beudant, Hausmann. A 

 titaniferous iron from Gastein. Occurs in 

 crystals, having the form of Ilmenite and 

 Iron Glance, but generally massive or in 

 thin plates or laminte. Slightly magnetic. 

 H. 5 to 5-5. S.G. 4-66. 

 Analysis, by v. Kobell : 

 Titanic acid .... 59-00 

 Protoxide of iron „ . . 36-00 

 Peroxide of iron . . . 4-25 

 Protoxide of manganese . 1 65 



100-90 



Kibdelophane is the Axotomous Iron of 

 v. Kobell. 



See Ilmenite and Titanate of Iron. 



Brit. Mus., Case 37. 



Kidney- stones. A local name for small 

 hard nodules, not unlike septaria, composed 



