EMERALD NICKEL. 



Carbonate of lime 



. 47-8 



Carbonate of magnesia 



. 16-7 



Carbonate of manganese 



. 0-5 



Silica .... 



. 24-4 



Alumina . . 



. 5-5 



Glucina 



. 0-5 



Peroxide of iron . 



. 2-6 



Pvrites. 



. 0-6 



Alkali .... 



. 2-7 



101-2 

 Other localities are Columbia in a black 

 bituminous limestone of comparatively re- 

 cent age. Cundina-Marca, N.E. of Santa- 

 Fe in Old Columbia. Peru*, in the valley 

 of Tunca, between the mountains of New- 

 Grenada and Popayan. Norway. The hill 

 of Barat near Limoges. Canjargum in liiu- 

 dostan. Salzburg, imbedded in mica-slate. 

 ■ Brit. Mus., Case 37. 



iHf.P.G. *Horse-shoe Case, Nos. 818, 825 

 to 835. 



E.MKRALD Nickel, Silliman, Jr. Occurs 

 in the form of small stalactitic or mammil • 

 lary crusts ; sometimes apoearing prismatic, 

 with rounded summits; also massive and 

 compact. Colour emerald-green. Lustre 

 vitreous. Transparent to translucent. Streak 

 yellowish-green. Brittle, with an un- 

 even, somewhat scaly fracture. H. 3 to 

 3-25. S.G. 2-57 to 2-69. 



Comp. Ni3 C + 6 H, or Ni C + 2(Ni, 3 H) 

 = oxide of nickel 59-72, carbonic acid 11*66, 

 water 28-62 -100-00. 



Analysis from Texas, bv SilUman, Jr. : 

 Oxide of nickel . ' . . 5882 

 Carbonic acid . . . 11-69 

 Water 29-49 



100-00 

 Heated in a flask gives of water, and turns 

 ,| blackish-grey. 



i BB with borax yields a transparent glo- 

 bule of a dark yellow or reddish colour 

 when hot, but nearly colourless when cold. 



Readily soluble in muriatic acid, leaving 

 a residue of chrome iron. 



Localities. This rare mineral is found 



forming a crust on Chromic Iron at Texas, 



Lancaster co., Pennysylvania, U. S. ; and 



at Swinaness, in Unst, one of the Shetlands. 



Brit. Mus., Case 49. 



* In the collections of the Museum of Natural 

 History in Paris, there are Emeralds known to 

 have formerly adorned the Til raoi Pope Julius II. 

 (150S to 1513), who died thirtv-two years before 

 the conquest of Peru by Pizarro. 



EMERY. 127 



Emeraude Vert, Hady. See Emerald. 



Ejieraude du Perou, Rome de Lisle. 

 See Emerald. 



Emerald Copper, Phillips; Emerald 

 Malachite, 3Iohs. See Dioptase. 



Emeril, Haiiy. Emery. An amorphous 

 form of Corundum. Occurs massive, gran- 

 ular, or compact. INIore or less impure. 

 When compact, exceedingly tough. Frac- 

 ture conchoidal to uneven. Streak white. 

 H. 4-0 to 5-7. S.G. 3 89 to 4-28. 



Comp. Pure alumina, or Al. 

 Analysis: a from Naxos ; 6fromGumush- 

 dagh, by J. Lawrence Smith : 



a b 



xa. . . . 



S.G. . 



. 3-75 



3-82 



Alumina . 



. 68-53 



77-82 



Peroxide of iron 



. 24-10 



8-62 



Silica 



. 3-10 



8-13 



Lime 



. 0-86 



1-80 



Water 



. 4-72 



3-il 



101-31 99-48 



The column of hardness gives the effec- 

 tive abrasive power of the powdered mineral, 

 that of Sapphire being 100. 



BB unaltered both alone and A\dth soda; 

 fuses entirely with borax, though with great 

 difficulty ; and also, if powdered, with salt 

 of phosphorus. 



Not affected by acids. 



Localities. Emery -stone is said to occur 

 in Jersey ; at Madron, in Cornwall ; and at 

 the base of one of the Mourne mountains, 

 CO. Down. — Foreign. In large boulders at 

 Naxos, Nicaria, and Samos, in the Grecian 

 Archipelago. In granular limestone in Asia 

 Minor, near Gumush-dagh, 12 miles E. of 

 Ephesus, associated with Margarite, Chloro- 

 toid, Pyrites, Calc-spar, &c. ; also at Kulah, 

 Adula, and Mauser, 24 miles north of 

 Smyrna. With talcose- slate at Ochsenkopf 

 in Saxony, of a dax'k blue or black colour, 

 much resembling fine-grained basalt. Italy. 

 Spain, ike. 



The Emery generally used in this country 

 is found in the Island of Naxos, in the 

 Grecian Archipelago, where it occurs in 

 large blocks imbedded in a red soil, and 

 sometimes in white marble. These blocks are 

 so abundant that, notwithstanding the im- 

 mense quantities carried off, it is not yet requi- 

 site to quarry the rock itself. This substance 

 is of so much val ue in the arts, that an English 

 merchant found it advantageous to obtain 

 a monopoly of it from the Greek govern- 



