94 
NARKOW VEINS 
Shelf III. 
15. Septarian Nodule of Clay 
Ironstone, the cracks partly 
filled with large crystals of Zinc 
Blende. 
Wolverhampton. 
16. Septarian Clay Ironstone, 
the cracks of which are only partly 
filled with Blende, Iron Pyrites, 
Spathose Iron, &c. 
Wolverhampton, Staffordshire. 
17 and 18. The two halves of 
a horizontally split nodule of 
Clay Ironstone, the cracks filled 
with Carbonates of Iron and Lime, 
and a little Blende and Copper 
Pyrites in the centre. 
One of the “ Cheeses'’ Ironstones, 
Black Shale Rake, Chesterfield. 
19. Copper Pyrites, in minute 
crystals, on Brown Spar, in the 
cracks of the 
Cheeses Ironstone, Chesterfield. 
20. CopperPyrites and Galena, 
with Brown Spar, in cavities of the 
“ Old Man” Ironstone, Chesterfield. 
Examples of Strings or narrow 
Mils 
Shelf lY. 
26. Ganger or Vein-stuff of 
black indurated Clay, locally 
termed “ Glauch,” and occurring 
with the rich veins of Tellurium 
and Gold. 
Nagyag, Transylvania. 
27. Clay Slate (“ killas”) in¬ 
tersected by veins of Quartz, and 
these again by cross strings of 
black Tourmaline or Schorl. 
Near the edge of the granite, 
at Carclaze, St. Austell, Corn¬ 
wall. 
28. Clay Slate, charged with 
Mica, and intersected by veins of 
Quartz. 
From Carclaze, St. Austell, Corn¬ 
wall. 
Nos. 27 and 28 presented by W. W. 
Smyth, F.R.S. 
21. Zinc Bleniie, a group of 
brilliant crystals, in clay ironstone. 
Cheese Measure, Hady, near 
Chesterfield. 
22. Example of curvilinear 
Fissures of Contraction, with 
Galena and Brown Spar. 
“ Old Man” Ironstone, Chester¬ 
field. 
23. Example of curvilinear 
Cracks of Contraction, filled in 
with Blende and Calcite. This 
specimen of the Balls ” iron¬ 
stone encloses, as not unfrequently 
happens, the stem of a fossil plant. 
Wolverhampton, Staffordshire. 
24. Angular Fragments of 
the Stone slightly cemented by 
Iron Pyrites to the sides of Fis¬ 
sures of Contraction. 
“ Old Man” Ironstone, Chester¬ 
field. 
25. Clay Ironstone, from the 
centre of a nodule, with crystal¬ 
lized Quartz, Siderite, and a fine 
twin crystal of Zinc Blende. 
Ystalyfera, Swansea Valley. 
Presented by Genl. Tremenheere. 
Veins composed chiefly^ of one 
RAL. 
29. Vein of Actinolite, with 
Epidote and Copper Pyrites. 
Knockmahon Mines, Co. Water¬ 
ford, Ireland. 
30. Veins of Calc- spar travers¬ 
ing Serpentine : a polished speci¬ 
men. 
Lizard, Cornwall. 
31. Veins of Barytes, inter¬ 
secting sandstone (the upper mill¬ 
stone grit). 
Wetley Moor, North Sta ffordshire. 
Presented by W. W. Smyth, F.R.S. 
32. Veins of Micaceous Iron 
Ore, traversing Sandstone. 
Rio, Elba. 
Presented by W. W. Smyth, F.R.S. 
33. Illustration of the “ squint¬ 
ing” of veins in passing through 
