172 HAYDENITE. 



In heated muriatic acid forms a white 

 transparent jelly. 



Localities. The older lavas of Vesuvius, 

 and the Papal States. Niedermendig, in 

 basalt. Near Andernach, on the Khiue, in 

 lava or pumice. 



Name. In honour of the French mineralo - 

 gist, Rene' Just Haiiy. 



Brit. Mus., Case 55. 



M. P. G. Horse-shoe Case, Xos. 1013, 

 1014. Upper Gallery, Table-case A, in re- 

 cess 4, Nos, 75 to 78. 



Haydenite, Cleveland. A yellowish va- 

 riety of Chabazite, occurring in reddish or 

 garnet-coloured scalenohedrons, which dif- 

 fer slightly from the rhombohedron. The 

 cr3^stals are often in twins, and incrusted 

 with Chlorite. It is very liable to decom- 

 position, becoming spongy or porous, but 

 still retaining its form. 



Analysis, by Delesse : 



Silica 49-5 



Alumina and peroxide of iron 23-5 



Lime 2-7 



Potash 2-5 



Magnesia .... trace 

 Water 21-0 



99-2 



BB fuses with some difficulty to a yel- 

 lowish enamel. 



Soluble in hot sulphuric acid : while dis- 

 solving, it produces a curdled mass, but 

 afterwards the solution is clear. 



Locality. Jones's Falls, Maryland, U.S., 

 in fissures of gneiss. 



Name. After the discoverer. Dr. Hayden, 

 of Baltimore, U. S. 



Hayesine, Dana. Occurs in masses, hav- 

 ing a globular or mammillated form, which, 

 on being broken, present the appearance of 

 a lustrous mass of fine interwoven silky fibres 

 of a brilliant snow-white colour. Opaque. 

 Tasteless, but with a peculiar odour. H. 1. 

 S.G. 1-65. 



Comp. Na B2 + Ca2 b's + IOH. Hayes 

 states that the soda is an impurity, and that 

 the compesition of the pure mineral is repre • 



t .... 

 sented bv the formula Ca B2 + 6H = boracic 

 acid 45-95, lime 18-45, water 35-57 = 100. 



Eeichardt gives the formula Ca B* + 10 H. 

 Analysis, by Reichardt ; 



Boracic acid .... 52-05 



HEDIPHANE. 



Sulphuric acid 



0-53 



Lime . 

 Soda . 

 Chlorine 



11-56 



trace 



0-94 



Water 34-91 



99-99 



Localities. Nova Scotia, in narrow veins, 

 in Gypsum, with Glauber Salt. At the Tus- 

 can lagoons, as an incrustation. In white 

 reniform masses, called tiza, on the dry 

 plains near Iquique, in the province of 

 Tarapaca, in Southern Peru, whence it has 

 of late years been imported to Liverpool. 

 (See Tiza.) 



Named after Hayes. 



Brit. Mus., Case 39. 



M. P. G. Horse-shoe Case, No. 229. 



Haytokite. Pseudomorphous Chalcedony 

 in the form of Datholite, found at the Hay- 

 tor Iron Mines in Devonshire; fig. 226. 



Fig. 226. 



Also at N, Roskear Mine, Cornwall ; and in 

 cavities of compact radiating Prehnite in the 

 Isle of Mav, Frith of Forth, /^. 226. 



Brit. Mus., Case 22. 



J/. P. G. Horse-shoe Case, No. 534. 



Heavy Spar, Jameson. A name given 

 to Barytes in consequence of its great 

 specific gravity. 



Hebetine. An impure variety of anhy- 

 drous silicate of Zinc or Willemite. 



Hedenbergite. a black variety of 

 Augite, containing a large proportion of 

 iron, little or no magnesia, and no alumina. 

 S.G. 3-5, 



Comp. ( Ca, Fe) si^. 



Analysis, by H. Rose : 



Silica ..... 49-01 



Protoxide of iron . . . 26-08 



Lime 20-87 



Magnesia .... 2-98 



Protoxide of manganese . trace 



98-94 

 BB fuses readily to a shining black glass. 

 Locality. -.Tunaberg in Sweden. 

 Name. After L. Hedenberg, the Swedish 

 Chemist. 

 Hedgehog-stone. See Stachelswein- 



STEIN. 



Hediphane, Dufrenoy. Hedyphane, 

 Breithaupt. A whitish variety of Mimetite, 

 usually occurring in amorphous masses, 

 with a subadamantine or resinous lustre in- 

 clining to greasy. H. 3 to 4. S.G. 5-3 to O'o. 



