OF ONE MINERAL. 
95 
dissimilar strata. Veins of Calc- 
spar traversing Limestone and 
Chert. 
Ecton Mine, Staffordshire. 
34. Illustration of the irregu¬ 
larities in veins, when traversing 
beds of different hardness and 
tenacity. Veins of Calc-spar, 
passing through Limestone and 
Chert. 
Ecton Mine, Staffoi'dshire. 
35. String of Copper Pyrites, 
with a little Quartz, traversing 
slate. 
Consols Mines, Gwennap, Corn¬ 
wall. 
Shelf V. 
36. Strings of Copper Pyrites 
and Blende, mingled with Chlorite, 
traversing slate. 
Sinner Downs Mine, Crowan, 
Cornwall. 
37. String of Copper Pyrites, 
in Slate: smaller strings branch 
off from the main vein. 
Huel Tolgus, Redruth, Cornwall. 
Presented by John Michell. 
38. String of Copper Pyrites, 
traversing Slate. Exhibits the 
manner in which Copper Pyrites 
sometimes suddenly stops, and is 
replaced by Quartz, even in lodes 
of large size. 
Huel Music, St. Agnes, Cornwall. 
39. Very thin strings of 
Chi.orite (“ Peach” of the 
miners), traversing green Fluor, 
in the copper lode of 
Huel Unity Wood, Cornwall. 
40. A string of dark Purple 
Copper Ore, or Bornite, inter¬ 
secting the mass of a mixed lode. 
Huel Fortune, Marazion, Corn¬ 
wall. 
41. A string of Copper Pyrites, 
traversing the general mass of a 
lode. 
Consols Mines, Gwennap, Corn¬ 
wall. 
42. Vein of Quartz, the cry¬ 
stals meeting in the centre, tipped 
with Red Iron Ore, traversing 
Slate rock, with Copper Pyrites. 
Great St. George Mine, Perran- 
zahuloe, Cornwall. 
43. Vein composed of Quartz, 
Calcite, Epidote, &c., showing a 
deposition of the parts obliquely 
across the vein. 
West of Dane's Island, near Bon- 
mahon, Waterford, Ireland. 
44. Vein of Fluor alone tra* 
versing grey beds of carboniferous 
limestone. 
Cockwell Mine, Ashover, Derby¬ 
shire. 
Shelf VI. 
45. Vein of Steatite, travers¬ 
ing serpentine rock. 
Near Black Head, St, Keverne, 
Cornwall. 
46. Haematite, filling the cracks 
of a chalk flint. 
Orleigh Court, Bideford, Devon¬ 
shire. 
47. String of very crystalline 
Cassiterite, or Oxide of Tin. 
St. Austell, Cornwall. 
48. Vein of Quartz, intersect¬ 
ing killas” or clay slate, from a 
Tin Mine. 
St. Agnes, Cornwall. 
49. Poor strings of Copper 
Pyrites traversing pink granite. 
Cornwall. 
Shelf VII. 
50. Strings of Copper Ore 
(Sulphide and Black Oxide), tra¬ 
versing white “killas” or clay 
slate, from very rich shallow parts 
of the workings. 
Great St. George Mine, Perran- 
zabuloe, Cornwall. 
Presented by H. Humphries. 
51. Very irregular strings of 
Copper Pyrites, traversing dark 
killas. 
Fowey Consols, St. Blazey, Corn¬ 
wall. 
Presented by the late J, Austen 
Treffry. 
