162 GRAUBRATJNSTEIN. 



Keswick, now nearly exhausted, a single 

 mass of Graphite was found, about fifty 3'ears 

 ago, which yielded about 70,000 lbs of the 

 purer black-lead, worth about 30s. a lb. 

 Graphite is also found at Bannerdale, near 

 Keswick; in Cornwall, nearPenryn, and at 

 Grampound and Boscastle ; at Beary, in the 

 Isle of Man ; in detached pieces, fit for com- 

 mon uses, at Killimore, in the Island of Mull. 

 — Irish. Kilkenny. — Foreign. It also occurs 

 in Gi'eenland. At Pargas, in Finland. Aren- 

 dal, in Norway. Passau, in Bohemia. Prus • 

 sia. France ; at Pontivy, in Brittany ; in 

 PAveyron, &c. Spain. Constantine, in 

 Algeria. Ceylon. ' Travancore. Canada, at 

 Grenville and Burgess. Mines are worked 

 for this mineral in the United States, at 

 Sturbridge, Massachusetts ; Ticonderoga and 

 Fishkill, N.Y., Brandon, Vt., and Wake, 

 N.C. There is also a large deposit at St. 

 John's, New Brunswick. 



Name. The name Graphite is derived 

 from ye,o!.<pv, to write, in allusion to the pur- 

 poses to which it is frequently applied. 



Graphite is largely employed under the 

 name of Plumbago, or Black - lead, for 

 brightening iron, and protecting it from 

 rust, and for diminishing friction in ma- 

 chinery. Crucibles are also made of it, 

 which are capable of sustaining intense 

 heat, and possess greater tenacity and ex- 

 pansibility than those made from ordinary 

 clays. Its principal use, however, is in the 

 manufacture of black-lead pencils. 

 Brit. Mus., Case 4, 



31. P. G. Principal Floor, Wall-cases 



39 (Ceylon and Travancore) ; 41 (Canada). 



Horse-shoe case, Nos. 17 to 54 



Graubraunstein, Haus 



mann. 

 Grau braunstein 

 Hnusmann, Wer 

 Graucobalterz. See Syefoorite. 

 Grauerz. See Galena. 

 Graugiltigerz. a dark grey copper 

 (Tetrahedrite), rich in silver, from Wolfach, 

 forming dodecahedrons with tetrahedral 

 and cube-faces. S.G. 5-007. 



qnently engaged for a long period m seeking for 

 the graphite. Some years since a very large quan- 

 tity of plumbago was obtained from Borrowdale ; 

 this has been stored by the proprietors, and sold 

 in small parcels from time to time. The mine 

 has not been worke 1 for several years; it was 

 examined by some skilled miners since the cessa- 

 tion of the work, and their opinions were not such as 

 would lead us to believe that any large quantity of 

 black lead would he discovered' by any extension 

 of the workings." — R. Hunt's Descriptive Guide. 

 Workings have been again commenced, and, it 

 is said, with some prospect of success. 



OS. 1/ to 0-1 



[N, Haus-^ 



[nerz, r 



''erner. J 



Manganite. 



See 



Pyrolusite. 



GREEN EAUTH. 



Comp. (3Zn S, 4Fe S, 5Ag S) + 12 Cix^ S 

 + 6SbS3 = 4[(f|Zn,^Fe,^Ag) S] Sb S^ 

 + Cu2 S, Sb S3. (Gmehn.) 

 Analysis, by H. Rose : 



Zinc . . . , . 3-10 



Iron 3*72 



Silver 17-71 



Copper 25-23 



' Antimony .... 26-63 

 Sulphur .... 23-52 



99-91 

 Graukupferez. See Tennantitb. 

 Graulite. See Tectizite. 

 Grausilber. See Selbite. 

 Grauspiessglakzerz, "^ 

 Hausmann. I Grey Antimony. 



Grauspiessglaserz, j See Stibnite. 

 Werner. J 



Greasy Quartz. Those varieties of 

 Milk-Quartz which display a greasy lustre. 

 Green Calamine, Patrin. Aurichalcite, 

 found in cavities near Klopinski. 



Green Carbonate of Copper, Phillips. 

 See Malachite. 



Green Diallage, Haidinger. Consists 

 in some cases of laminge of Amianthus, 

 alternating with laminse of Augite, both 

 frequently of bright green colours, and 

 forming a curious mixture in some of the 

 rocks of Corsica, Monte Rosa, and the 

 Bacher. In some specimens the passage 

 from black crystallized Hornblende into 

 white, silky Asbestos is distinctly visible. 

 (Allan.) 



Green Earth, Kirwan, Jameson, Phil- 

 lips, Greg Sf Lettsom. An altered form of 

 Pyroxene, produced by the action of alka- 

 line carbonates in solution ; in which case 

 alkalies take the place of the removed bases, 

 and an alkaline silicate of alumina, or of 

 iron and alumina, is formed. Green Earth is 

 met with in small masses of an earthy or 

 minutely crystalline appearance in, or Iming 

 cavities 'of, amygdaloid. Colour dark olive- 

 green, with an unctuous feel. The Green 

 Earth from Mount Baldo approaches to apple- 

 green. Opaque. Soft: yields to the nail. 

 Fracture generally earthy, glimmenng, 

 dull. S.G. ^2-79 to 2-83. 



Analysis, from Fassa, by Rammelsberg : 



Silica 45-87 



Alumina . . . • 11*18 

 Protoxide of iron . . • 24-63 

 Magnesia . . • • 0'28 



Lime I'^O 



Potash and soda . . • 6-72 

 Water .... - 9-82 



100-00 



