80 CHLOROPH/EITE. 



amorphous mineral related to Halloysite, of 

 a greenish-yellow colour, and with a weak 

 Avaxy lustre. Opaque to sub transparent. 

 Streak greenish-white. Brittle. Fracture 

 splintery and conchoidal. H. 2*5 to 3. SG. 

 2-1 to 2-15. 



Comp. Fe Si2 + 3H. = Silica 45'9, perox- 

 ide of iron 40-5, water 13-7-100-0. 



Analysis of compact specimen from Hun- 

 gary, bv Btrnhardi ^ Brandes : 



Silica . ||. . . .46 

 Peroxide of ifou . . .33 

 Alumina .... 1 

 Magnesia .... 2 

 Water 18 



100 



BB infusible, but becomes black and 

 then brown. 



Partially soluble in muriatic acid, •v^hich 

 takes up the hydrate of iron. 



Locality. Hungary. 



Name. From x^-^?'? green and Opal. 



Brit. Mus., Case 26. 



Chloroph.eite. a mineral discovered by 

 D. Macculloch in the amygdaloid of Scuir 

 More in Rum. It occurs foliated, or granu- 

 lar, massive, incrusting or disseminated in 

 small grains or nodules, in basalt or amyg- 

 daloid. Colour translucent pistachio- or 

 olive-green, which soon changes to opaque 

 dark-brown or black, with the aspect of Jet 

 or black chalk, according to the degree of 

 lustre or transparency. Lustre dull sub- 

 resinous. H. 1-5 to 2.'S.G. 2-02. 



Comp. Fe Si + 6H = Silica 33-5, protoxide 

 of iron 26 6, water 39 9 = 100-0 



Analysis from Faroe, by Forcliammer : 



Silica 32-85 



Protoxide of iron . . 22-08 

 Magnesia .... 3-44 

 Water .... 41-63 



100-00 



BB fuses to a black glass. 



Localities. The Faroe Islands ; Isle of 

 Eum, in Fife ; Antrim, Down Hill, in vesi- 

 cular greenstone. 



Name. From x>-C''s.'f>?, green, and (path;, brown, 

 in allusion to the change of colour Avhich 

 takes place m the course of a few hours. 



Brit. Mus., Case 26. 



Chlorophane. The name given to those 

 varieties of Fluor which, when heated, shine 

 with a phosphorescent light of a peculiarly 

 bright emerald-green colour. This they 

 will exhibit repeatedly, if not subjected to 

 too great a heat. This property is observ- 



CHONDRODITE. 

 able in some Cornish specimens, but in a 

 remarkable degree in a violet-coloured Fluor 

 from Nertschinsk in Siberia. In the United 

 States Chlorophane forms two veins in 

 gneiss at Turnbull, Connecticut, accompanied 

 by Topaz and Magnetic Pyrites. 



Name. From x^'^s}?, green, and <?«/>«, to 

 seem. 



Chlorophyllite, Jackson. Probably an 

 altered or hydrated variety of lolite. Colour 

 green or brownish. Lustre of basal plane, 

 pearl}'; of lateral planes, pearly or greasy 

 to imperfectly vitreous. Translucent to sub- 

 translucent. Highly foliated parallel to the 

 base of the prism. Brittle. H. 0-5 at the 

 edges ; of the basal planes 1-5 to 2. S. G. 

 2-705. 



Comp. R5 Si2 + s'it Si + 2H or loli te + 2H. 



Localities. The United States, at Neal's 

 Mine in Unit}', Maine, and at Haddam, Con- 

 necticut, in large four-, six-, eight- or twelve- 

 sided prisms, or in foliated masses — usually 

 associated with lolite in granite. 



Name. From %A<w§fl? green, and (pixxov, a 

 leaf; in allusion to its colour and structure. 



Brit. Mus., Case 32. 



Chlorquecksilber, Berzelius. See Ca- 

 lomel. 



Chlorsilber, Berzelius. See Kerargy- 

 rite. 



Chlorospinel, G. Rose. A grass- green" 

 Spinel from Slatoust in the Ural, in which 

 a part of the alumina is replaced by per- 

 oxide of iron. Streak vellowish-white. 

 H. 8. S.G. 3-591 to 3-594. " 



Comp. Mg (Al Fe). 





Analysis by G. Rose : 





Alumina . 



. 64-13 



Magnesia . 



. 26-77 



Peroxide of iron 



. 8-70 



Lime .... 



. 0-27 



Oxide of copper , 



. 0-27 



100-14: 



Becomes brownish-green when heated. 



BB with borax fuses easily to a light- 

 green glass, which is colourless when cold. 



Brit. Mus., dase 19. 



Chodneffite. See Cryolite. 



Chondrodite, d'Ohsson. Rhombic; oc- 

 curs in indistinct crystalline masses, or im- 

 bedded grains of a wax-yellow or brown 

 colour, having occasional but not very de- 

 cided appearances of regular crystalline 

 form. Lustre vitreous— resinous. Trans- 

 lucent. Yields to the knife with difficulty. 

 Streak white, or slightly yellowish or grey- 



