HALLOYSITE. 



Localiti/. The neighbourhood of Liege 

 and Namur; Avith ores of zinc, lead, and 

 iron. Housscha near Bayonne, ia graphic 

 granite. Milo in a pumiceous tufa. Upper 

 Silesia. Guateque in New Granada, &c. 



Name. Named by Berthier after his 

 uncle Omalius d'Halloy, by whom it was 

 first noticed. 



Brit. Mas., Case 26. 



Halloysites are richer in alumina than 

 Smectite, and contain like it 24 to 25 per 

 cent, of water. 



Halloysite of St. Jean-de-Cole. A 

 rose-coloured Nontronite, found at Thiviers. 



Halotrichine, Scacchi. A silky variety 

 of Iron-alum from the Solfatara. 



Comp. 3Fe S + 2M S3 + 54H. 



Analysis : 



Alumina . . . . 9'76 

 Protoxide of iron . . . 10-20 

 Sulphuric acid . . .34-12 

 Water 45-92 



100-00 

 Halotrichite, Brooke §- 3IUler. An 

 Iron-alum. 



Occurs in fibrous, silky masses of a yel- 

 lowish-white colour. Taste sweet and 

 astringent, somewhat resembling that of 

 ink. 



Co7np. Fe S + Al S3 + 24H = sulphate of 

 iron 16-4, sulphate of alumina 37-0, water 

 46-6 = 100. 



Analysis, from Morsfeld, by Rammelsberg : 

 Alumina .... 10-914 

 Protoxide of iron . . 9-367 

 Sulphuric acid . . . 36-025 

 Magnesia .... 0-235 

 Potash ... . 0-434 

 Water .... 43025 



100-000 



Soluble in water. 



Turns red, and parts with its water when 

 heated. 



Localities. — British. Abundantly in the 

 shale of exhausted coal-beds at Hurlet and 

 Campsie, near Paisley, probably mixed with 

 Melanterite or sulphate of iron. — Foreign. 

 Bodenmais and Morsfeld in Rhenish Bava- 

 ria. Oroomiah in Persia, where it is used for 

 making ink of a fine quality. 



Name. From «a?, suit, and ^f/|, hair. 



Brit. Mus., Case 55. 



Hajiatit, Haidinger, Hausmann. See 



HE3LA.TITE. 



Hampshirite, Hermann. The name 

 given to the Steatite of certain steatldc 



HARMOTOME. 



pseudomorphs (mostly after Quartz), 

 scribed and analysed by Dewey. 

 Analysis : 



Silica .... 



Alumina 



Magnesia 



Protoxide of iron . 



Protoxide of manganese 



Water .... 



169 

 de- 



50-60 

 0-15 



28-83 

 2-59 

 1-10 



15-00 



97-27 



Locality. Middlefield, Hampshire co., 

 U.S., ; in a great bed of Serpentine. 



Hard Coal. Those kinds of Coal which 

 burn without caking, and leave a white ash. 



Hard Fahlunite, Berzelius. A brown- 

 ish-yellow variety of lolite, which owes its 

 peculiar colour and opacity to accidental ad- 

 mixture. 



Locality. Fahlun in Sweden. 



Hard Lithomarge. See Teratolite. 



Hard Spar, Jameson. See Andalusite. 



Harmotome, Dana, Greg Sj" Lettsom, 

 Hai'iy, Phillips. Rhombic. Sometimes oc- 

 curs in flattish rectangular prisms, termi- 

 nated by rhombic planes, replacing the 

 solid angles of the prism ; these crystals 

 often cross each other lengthwise and at 

 right angles, so that their axes coincide; 

 hence the name Cross-stone, applied to it by 

 Jameson and others. Colour generally grey- 

 ish-white, passing into grey, 3'ellow, red, or 

 brown. .Translucent. Lustre pearly. Streak 

 white. Brittle. Fracture uneven, imper- 

 fectly conchoidal. H. 4-5. S.G. 2-39 to 

 2-498. 



Fig. 223. Fig. 224. 



Fig. 225. 



Comp. Ba Si + Al 81^ + 5H = silica, 44-0, 

 alumina 16-6, baryta 24-8, water 14-6 = 100. 

 Analysis, from Strontian, by Koliler : 



Silica 46-10 



Alumina .... 16-41 



Barvta 20-81 



Linie . . . . 0-63 

 Potash .' . . . .0-90 

 Water 15 11 



99-96 

 BB on charcoal, melts easily, without in- 

 tumescence, to a clear glass. 



