256 NATROLITE DE HESSELKULA. 

 Silica . . . . . 46-96 

 Alumina . . . .26-91 



Soda 12-83 



Lime 3-76 



Water ..... 9-50 



99-96 

 BB on charcoal fuses quickly to a trans- 

 parent glass, full of small air- bubbles. 



Dissolves in muriatic acid, with the for- 

 mation of a jelly of silica. 



Localities. — English. Cornwall : Huel 

 Carne, near St. Just; between Botallack 

 and Huel Cock ; Stenna Gwynn, near St. 

 Austell. — Scotch. Arbuthnott and St. Cyrus, 

 Kincardineshire, in decomposed basalt. Stir- 

 lingshire; Campsie Hills, Carbeth, &c. 

 Dumbartonshire ; at Bowling, Cochnay, 

 Duntocher, Dumbarton Moor, &c. Blin, 

 near Burntisland, Fifeshire ; also at Glen 

 Farg, in flesh-red and colourless crystals 

 (fig. 308). i-)ishoptown, Renfrewshire. — 

 Irish. Cave Hill, Belfast, fibrous and com- 

 pact. Londonderry, Portsteward, and Ma- 

 gilligan. Antrim ; Craignashoke, Magee 

 Island near Larne, in fine crystals, and 

 radiating masses. — Foreign. Aussig, in Bo- 

 hemia. Puy de Mouton, in Auvergne, in 

 most brilliant crystals, in amygdaloid and 

 in cavities in peperino. Nova Scotia. Cop- 

 per Falls, Lake Superior, N. A. 



Name. From Natron, soda, and Xtdo;, stone. 



It was so named by Klaproth, by whom it 



was first described, on account of the great 



quantity of soda he found it to contain. 



For varieties of Natrolite, see Bergman- 



NITE, LeHUNTITE, IkADIOLITE, BrEVICITE, 



Galactite. 

 Brit. Mus., Case 27. 

 M. P. G. Horse-shoe Case, No. 1183. 

 Natrolite de HesselkuIxA.. See Eke- 



BERGITE. 



Natron, Kinvan, Beudant. Oblique. 

 Occurs crystallized, massive, fibrous, and 

 sometimes radiated, in crusts and elflores- 

 cences. Colour grey or yellowish-white. 

 Lustre glistening. Translucent, but becomes 

 opaaue bv exposure. Taste alkaline. H. 1 

 to 1-0. S.G. 1-4. 



Fig. 3C9. 



Comp. Na C + IOH, or hydrated carbo- 

 nate of soda = carbonic acid 26°7, soda 18 '8, 

 water 54-5 = 100. 



NEOCTESE. 



Localities. The soda 4akes of Egypt. The 

 hot springs of Carlsbad, in Bohemia; and 

 Rykum, in Iceland. The plains of Debreczin, 

 in Hungary. Vesuvius. Etna. Various 

 parts of Asia, Africa, and America. 



Name. From the name of the Desert 

 Natron, whence it is supposed to have been 

 procured in ancient times. 



This salt, the nitre of the Bible, is used m 

 bleaching, washing, dyeing, and in the 

 manufacture of glass and soap. The ancient 

 Egyptians are said to have prepared dead 

 bodies for the process of embalming, by 

 previously macerating them for several 

 months in a solution of this salt. 



Brit. Mus., Case 41. 



Natron Alaun, v. Kohell. See Soda 

 Alum. 



Natronalaun. See Soda Alum. 



Natron -chabazit. See Gmelinite. 



Natron Salpeter, Leonhard. See Nl- 



TRATINE. 



Natron-spodumene, ^erzeZms. See Oli- 



GOCLASE. 



Natural Soda, Jameson. See Trona. 



Natcjrliches Bittersalz, Werner. See 

 Epsomitb. 



Naumannite, Haidinger. Cubical. Oc- 

 curs in cubes, with a perfect cubic cleavage ; 

 also massive, in thin plates, and granular. 

 Colour and streak iron-black. Lustre me- 

 tallic. H. 2-5. S.G. 8. 



Comp. Ag, Se, or selenide of silver = sele- 

 nium 26-8, silver 73-2 = 100. 



BB on charcoal, fuses easily ; with soda 

 and borax yields a globule of silver. 



Locality. Tilkerode, in the Harz. 



Name. After Dr. C. F. Naumann, the 

 Saxon mineralogist. 



Necronite. (From vj^go?, « corpse.') A 

 variety of Orthoclase, which gives off a fetid 

 smell when struck. 



Nectic Quartz. See Float Stone. " 



Needle Ore, Jameson. See Aikenite. 



Needle Spar. A name for Aragonite 

 (which see). 



Needle Stone, Needle Zeolite, Jame' 

 son. Names given to acicular varieties of 

 Natrolite and Scolecite. 



Brit. Mus., Case 27. 



Nefelina, Monticelli. See Nepheline. 



Nemalite (from niM>;, a wood, and ^/^«f, 

 stone.) A fibrous variety of Brucite (which 

 see). 



Brit. Mus., Case 47. 



Neoctese, Beudant, A variety of Scoro- 

 dite from St. Antonio Perreira, near Villa 

 Rica, in Brazil, and near Edenville, New 

 York. Colour green. 



