HYDROCHLORE. 

 Hydrochlobe, Hermann. See Pyeo- 



CHT.ORE. 



Hydrohalite, Mitscherlich. A hydrous 

 chloride of sodium. 



Comp. Na, CI + 4H = chloride of sodium 

 62-0, water 38-0 = 100. 



The name is derived from ti'^'»i, water, and 

 X.X;, salt. 



Hydrolite, Beudant, De Dree. Hydro- 

 LiTH, Leman. Soda-Chabasite, or Gmelin- 

 ite. See Gmelinite. 



Fig. 239. 



The name (from li'^u^, water, and>-'''^o,-, stone) 

 has reference to the large amount of water 

 contained in the mineral. 



Brit. Mus., Case 27. 



Hydromagnesite, v. Kohell. Oblique; 

 in small crystals, which are generally aci- 

 cular, or bladed and tufted. Also amor- 

 phous or in chalk-like crusts. Colour and 

 streak white. Lustre vitreous to sub- 

 pearly ; also earthy. Brittle. H. 3-5. S.G. 

 2-14 to 2-18. 



Comp. 3(Mg C + H) + Mg H = magnesia 

 43-9, carbonic acid 36-3, water 19-8 = 100. 



Analysis, by Wachtmeister : 



Magnesia .... 42*41 

 Carbonic acid . . . 36-82 

 Silica, oxide of iron, &c. . 2-24 

 Water ..... 18-53 



100-00 



BB infusible ; gives off moisture, and is 

 finally converted into pure magnesia. 



Dissolves in acids with effervescence. 



Localities, Swinaness, Isle of Unst, in the 

 Shetlands, associated with Brucite. Hrub- 

 schitz in Moravia, in Serpentine. Negro- 

 pont, near Kumi. United States, with 

 Serpentine and Brucite, at Wood's and Low's 

 Mines, near Texas, Pennsjdvania. Hoboken, 

 New Jersey, in acicular crystals like Natro- 

 lite, and in earthy crusts. 



Name From ^Sa?, water, and magnesite. 



Brit. Mus., Case 47. 



Hydromagnocalcit, Bammelsherg. A 

 kind of Hydromagnesite,in which the mag- 

 nesia is partly replaced by lime. It is found 

 in spherical masses on Vesuvius. 



Hydro-nickel-magnesite, Shepard. See 

 Pennite. 



Hydrophane. a variety of Opal which 

 readily imbibes water and (though not 



HYDROSILICITE. 185 



naturally transparent) becomes so on being 

 immersed in it. It is found in Hungary, 

 and in Ireland, in small roundish masses in 

 amygdaloid, of a brownish-white colour, 

 near the Giants' Causeway, and at Cross- 

 reagh, parish of Bally willin. 



Name. The name is derived from z^'Sw?, 

 water, and (pacivai, to appear. 



It has also been called oculus mundi. 



Brit. Mus., Case 24. 



Hydrophilite, Glocker. A kind of Chlo- 

 ride of Calcium, found occasionally in Kar- 

 stenite and Gypsum, and in the matrix con- 

 taining Boracite at Luneberg in Hanover, 

 and also especially accompanying Rock Salt. 



Comp. Ca CI, or chlorine 63-79, calcium 

 36-21 = 100. 



Name, From vlu^^ tvater, and <?''a«?, a friend. 



Hydrophite, Svanherg. Massive, some- 

 times fibrous. Colour mountain-green to 

 blackish-green, with a feeble subvitreous 

 lustre. Ti-anslucent to opaque. Streak paler 

 than the colour. H. 2-6. S.G. 2 4 to 2-66. 



Comp. (Mg, Fe) Si + Mg H^. 



Analysis, from Taberg, by Svanherg : 

 Silica ..... 36-29 

 Alumina . . . .2 90 

 Protoxide of iron . . 22*72 



Protoxide of manganese . 1-66 

 Magnesia .... 21-08 

 Vanadic acid . . .0-11 

 Water . . . . . 16-08 



100-75 



BB turns black and becomes magnetic, 

 and finally melts to a black globule. 



Locality. Taberg, in Smaoland, with Pi- 

 crolite. 



Name. From ^^u^, water, and ophite. 



See also Jekkinsite. 



Brit. Mus., Case 35. 



Hy'^drosilicate of Manganese, Phillips. 

 See Ofsiiiose. 



Hydrosilicite, v. Waltershausen. A 

 calcareo-magnesian form of altered Augite, 

 occurring as a very thin snow-white and 

 amorphous crust (with Herschelite, Phillip- 

 site, and Calcite), coating cavities and cracks 

 in tufa at Palagonia, and Aci Castello in 

 Sicily. Fracture dull and uneven. H. 

 scarcely that of chalk. S.G. 2*2. 



Comp. Hydrous Augite, or W> Si^ + 3H. 



Analysis, by TValtershausen : 



Silica ..... 42-02 

 Alumina .... 4-95 



Lime 27-19 



Magnesia .... 3-41 



Soda 2*57 



Potash. .... 2-67 



