182 HVERSALT. 



ture granular and imperfectly lamellar. 



Scratched easily with a steel" point. H. 



3-25. S.G. 2-8Ci 



Analysis, by Thomson ; 



Silica 45-80 



Alumina .... 33 i^*2 

 Protoxide of iron . . . 4-32 

 ' Lime ..... 8-04 

 Magnesia . . . . 1'72 

 Water 4-16 



99-96 



BB infusible ; with fluxes yields a green- 

 ish glass. 



Insoluble in acids. 



Name. After the locality near Lake 

 Huron, U.S. 



HvKRSALT, Forchammer. An alum allied 

 to Halotrichite, in Avhich part of the alu 

 mina is replaced by peroxide of iron, and 

 part of the protoxide of iron by magnesia. 



Comp. (Fe, Mg) s'+ (Al Fe) s's + 24H. 

 A.nah/sis : 



Alumina . . . .11-22 



Peroxide of iron . 



Protoxide of iron . 



Magnesia 



Sulphuric acid 



Water . . 



100-00 



Localiiy. Iceland. 



Brit. Mus., Case 56. 



Hyacinth (or Jacinth). The name under 

 which are included the transparent bright 

 coloured varieties of Zircon. Hyacinth differs 

 from Jargoon merely in its colour, which is of 

 various shades of red,passinginto orange and 

 poppy-red. Though not much worn at the 

 present day, it is a valuable gem, and makes 

 a very superb ring-stone when of a bright 

 tint and free from flaws. The larger pieces 

 are sometimes made into seals. 



" Three various kinds the skilled as Hyacinths * 

 name, 

 Varying in colour, and unlike in fame : 

 One, like pomegranate, flowers a fiery blaze, 

 And one, the yellow citron's hue displays ; 

 One charms with paley blue the gazer's eye. 

 Like thp mild tint that decks the northern sky : 

 Astrength'ningpower the several kinds convey. 

 And grief and vain suspicions drive away." 



Localities. Hyacinth occurs in the sands 

 and alluvial deposits of certain rivers in 



* From the Lanidarinm (xiv.) of Abbot Mar- 

 bodus (Marboeuf), master of the Cathedral 

 School of Anjou, 1067 to 1081, when he became 

 Bishop of Rennes. Extracted from " Antique 

 Gems," by Rev. C. W. King, M.A. 



HYALITE. 



Ceylon ; also in the state of sand mingled 

 with various other Substances in the bed 

 of a stream at Expaill^' (Haute Loire) 

 in France, as well as in basalt near the 

 same place ; in volcanic tuff in Auvergne ; 

 at Bilin in Bohemia ; Sebnitz in Saxony ; 

 Pfltsch in the Tyrol ; Ohlapian in Transyl- 

 vania ; in Greenland; in the Zircon- syenite 

 of Fredericks-varn in Norwa}''; and in the 

 iron mines of Arendal ; at Miask in the 

 Urals ; at Vesuvius in white and blue octa- 

 hedra in Ryacolite ; in small colourless crys- 

 tals at Santa Rosa in New Granada; in 

 Scotland at Scalpay in Harris. Egypt, the 

 East Indies, &c. The hyacinth-red varie- 

 ties of Zircon are sold by the inhabitants of 

 Ceylon as inferior rubies. (Prinsep.) 



In speaking of the Hj'acinth Pliny says, 

 " Hunc colorem Indi sacon vocant et talem 

 gemman sacodion f but it is doubtful whe- 

 ther the Hyacinth of the moderns is one of 

 the stones known by the same name 

 (^{)ix.%.ii:dc;^ to the ancients. Jamieson sup- 

 posed that they applied this name to the 

 Amethyst or Sapphire. 



The name vo^y^ivdoi is derived from the 

 Persian and Arabian yacut (ruby). 



Brit. Mus., Case 26. 



31. F. G. Horse-shoe Case, Nos. 850, 

 853 to 858. 



Hyacinth Blanche Cruciforme, Rome 

 de Lisle. See Harmotome. 



Hyacinth de Ceylon. A French name 

 for Essonite or Cinnamon-Stone. 



Hyacinthe de Compostelle. See 



COMPOSTELLA HyACINTH. 



Hyacinth de Vesuve, Rome de Lisle. 

 Vesuvian. See Idocrase. 



Hyacinthe la Bella. The name given 

 by French lapidaries to Zircon, when of a 

 decided red tint. Mons. Launoy states that 

 it becomes of a much deeper tint on ex- 

 posure to air, and that it reassumes its ori- 

 ginal colour when placed in the dark. The 

 Italians apply the same name to orange-red 

 Garnet or Vermeille. 



Hyaclnthine. La Me- ") 

 therie | 



Hyacinth Blanche )■ See Meionite, 

 de Somma, Rome de \ 

 Lisle. J 



Hyalite, or Muller's Glass. A trans- 

 parent or semi-transparent variety of Opal, 

 occurring in small reniform, botrj^oidal, and 

 sometimes stalactitic forms, resembling co- 

 loftrless glass. 



Analysis, from Walsch, by Damnur : 



Silica 96-94 



Water 3 06 



100-00 



