128 EMERYLITE. 



inent, in consequence of which its price in 

 tills country has been greatly enhanced, and 

 at one time was as high as 30/. per ton. 



The largest quantity is used in grinding 

 and polishing plate-glass, but it is also very 

 extensively employed in the metal -trades, 

 and for various other purposes. Its prepa- 

 ration from the original blocks, as imported 

 into this country, is effected by first break- 

 ing with large hammers, and then reducing 

 to grains Avith steel-headed stamps driven 

 by steam power. It is afterwards passed 

 through various sieves, which assort it into 

 the different sizes required and known as 

 "flour," "corn," and "grinding emery," &c. 

 &c. Much of it is used in the manufacture 

 of emery-cloth and paper, in both of which 

 articles it is frequently largely adulterated 

 with iron slag, and other hard substances. 



Name. The name emery is derived from 

 Cape Emeri, in the island of Naxos, where 

 it is found. 



Brit. Mus., Case 19. 



31. P. G. Horse-shoe Case, No. 782. 



Emeryltte, Smith. See Margarite. 



Emmonite, Thomson. A snow-white 

 variety of Strontianite, with an obscurely 

 foliated structure, and a s^aly appearance, 

 not unlike some varieties of Gypsum. Trans- 

 lucent at the edges. Very easily reduced 

 to powder. Fracture flat, and smooth in 

 the direction of the cleavage-planes. H. 

 2-75. S.G. 2-94. 



It contains 82*7 per cent, of carbonate of 

 strontia, and 12-5 per cent, of carbonate of 

 lime. 



Name. After Prof. Emmons, of William's 

 College, Massachusetts, U. S. 



Enargite, Breithaupt. Khombic. Colour 

 iron-black, with a metallic lustre. Streak 

 black. Brittle. Fracture uneven. H. 3. S.G. 

 4-36 to 4-45. 



Comp. (-e-u, Fe, Zn) S + i(As, Sb)2 Ss 

 = sulphur 32-5, arsenic 19-1, copper 48-4 = 



loo-o: 



Analysis by Plattner : 



Sulphur .... 32-22 

 Arsenic .... 17-59 



Antimony . . . .1-61 



Copper 47-20 



Iron 0-56 



Zinc 0-22 



Silver 001 



99-44 

 BB with borax, in the reducing flame, 



affords a globule of copper. 



Locality. In large masses, in limestone, 



associated with Tennantite, at Morococha, 



EPIDOTE. 



at an elevation of 15,000 feet in the Cordil- 

 leras of Peru. 



Enceladite, T. Sterry Hunt. See War- 



WICKITE. 



Named after Enceladus, one of the Titans 

 of ancient mythology. 



Endellionb, Bournon; Endellionite. 

 This mineral was originally described by 

 Count Bournon, and named by him after 

 the locahty, Endellion, in Cornwall, where 

 it Avas first discovered. It was subsequently 

 called Bournonite : which see. 



31. P. G. Principal Floor, Wall-case 14, 

 No. 647. 



Enhydros, J. Woodwird. Enhydrite, 

 (Yvova'iv^ within, SM.6. ii^a>?, water), the name 

 given to crystals or nodules containing 

 water. 



Brit. Mus., Case 22. 



Entomous Cobalt Pyrites, 3Iohs. Ull- 

 mannite (in part). 



Ephesite, J. L. Smith. A mineral allied 

 to Margarite. It has a pearly-white colour, 

 and a lamellar structure, and resembles 

 white Kyanite. Scratches glass. S.G. 3-15 

 to 3-2. 



Analysis (mean of two), by Smith : 



Silica 30-79 



Alumina .... 57-17 



Lime 2-00 



Protoxide of iron . . .1*17 

 Soda and a little potash . 4-41 

 Water 3-10 



98-63 

 Locality. The emery locality of Gumush- 

 dagh, near Ephesus, on Magnetite. 



Epichlouite, Rammelsberg. A fibrous or 

 columnar mineral between Schiller Spar and 

 Chlorite. Colour dull leek-green; bottle- 

 green and translucent when in thin 

 columns. Lustre greasy. Streak white to 

 greenish. H. 2 to 2-5. S.G. 2-76. 



Comp. SRS Si + ±t2 "^15 + 9H. 



Analysis by Rammelsberg : 



Silica 40-88 



Alumina . . . .10-96 

 Peroxide of iron . . . 8-72 

 Protoxide of iron . . . 8-96 

 Magnesia .... 20-00 



Lime 0-68 



Water 10-18 



100-38 

 BB fuses with difficulty in thin fibres. 

 Locality. Eadauthal. liarzbugh in Bruns- 

 wick . 



Epidote, TIaily, Phillips. Comprises 



