OPvES OF ZINC. 
ii)a 
the requiremeuts of the country, and there are annually imported 
from 22,000 to 24,000 tons of metallic Zinc or Spelter, from Belgium 
and Prussia. 
Blende, or Zinc-Blende, ‘‘Black Jack,” and “Mock Ore” of the 
miners (Sulphide of Zinc) ; zinc, 67 ; sulphur, 33. 
Wall Case 12. 
Shelf I. 
508. Blende : This specimen 
is apparently the top of some large 
crystals of Blende, covered by i 
quartz crystals ; as is very common | 
in Cornwall, portions of Copper 
Pyrites are enveloped in the Sul¬ 
phide of Zinc. 
From Huel Fortune, Marazion, 
Cornwall. 
Presented by Sir H. De la Beche. 
509. Blende, massive, crystal¬ 
line, occurring with Calcite and | 
Galena. i 
Milltown Lead Mine, County 
Clare, Ireland. 
Presented by W. W. Smyth, F.R.S. 
510. Blende, crystallized, and 
coated with crystals of Calcite and 
Iron Pyrites. | 
Talar Goch Mine, Flintshire. 
Presented by Captain Ishmael Jones, 
1851. 
511. Blende, with Galena. 
Caegwernog and Berthllwyd Silver- 
lead Mines, Llanelltyd, near 
Dolgelly, North Wales. 
Presented % J. Harvey. 
512. Blende, auriferous, with 
Galena. 
Prince of Wales Mine, near Dol¬ 
gelly, Merionethshire. 
Shelf II. 
513. Blende, crystallized with 
Calc Spar, on Sandstone. 
Grassington Mines, near Skipton, 
Yorkshire. 
Presented by Captain Eddy. 
514 & 515. Blende, crystallized. 
Nent Head, Cumberland. 
516. Blende, opaque black 
variety, crystallized on Limestone. 
Aldstone Moor, Cumberland. 
517. Blende, incrusted with 
crystals of Quartz. 
Nent Head, Aldstone Moor. 
Presented by And. Smith. 
Shelf III. 
518. Blende, crystallized on 
Quartz. 
Aldstone Moor. 
519. Blende, crystallized with 
Quartz, and encrusting Fluor-spar. 
Northumberland. 
520. Blende, crystallized with 
Fluor-spar. 
Northumberland. 
521. Blende, black opaque 
variety, crystallized and massive. 
522. Blende, crystallized. 
Huel Kitty, St. Agnes, Cormvall. 
523. Blende, massive, crystal¬ 
line. 
Huel Hope, Gwennap, Cornwall. 
524. Blende, with Quartz. 
Shelf lY. 
525. Blende, massive, crystal¬ 
line. 
Flintshire, North Wales : locally 
called “ Flintshire Jack.'' 
526. Blende, crvstallized and 
massive. 
527. Yeins of Blende in 
Silurian slates. 
From the Lead Mine, near Llyn- 
y-Parch, Bettws-y-Coed, Caer¬ 
narvonshire, North Wales. 
528 to 530. Blende, crystal¬ 
lized with calcite and copjier 
pyrites, in the Mountain Lime¬ 
stone. 
Staunton Harold, Ashby de la 
Zouch, Leicestershire. 
531. Blende, occurring in the 
clay Ironstone of the Coal Mea¬ 
sures. 
South Staffordshire. 
Presented by W. W. Smyth, F.R.S. 
532. Blende, crystallized in a 
cavity in Argentiferous Galena. 
Goginan Lead Mine, near Aber- 
ystwith, Cardiganshire. 
Presented by G. Fosset. 
