118 
MINERAL VEINS. 
470. Iron Pyrites, which has 
been deposited on Gypsum ? and 
on Fluor Spar. 
Virtuous Lady Mine, Tavistock, 
Devonshire. 
471. Unusually large example 
of Pseudomorphous Carbonate 
OF Iron. 
Virtuous Lady Mine, Tavistock. 
472 and 472a. Pseudomorphous 
crystals of Carbonate of Iron. 
Virtuous Lady Mine, Tavistock. 
Such forms as the specimeus Nos. 471 
and 472 are locally termed “ Slippers/^ 
and have been formed by the incrustation 
of crystals, probably of gypsum, by car¬ 
bonate of iron. 
473. Copper Pyrites and 
Quartz, crystallized in cavities of 
pre-existing cubic crystals. 
Virtuous Lady Mine, Tavistock. 
474 to 476. Tetrahedral crystals 
of iridescent Copper Pyrites, 
with Quartz, in cubic cavities of 
Carbonate of Iron, left by the dis¬ 
appearance of Fluor. 
Virtuous Lady Mine, Tavistock. 
477. Quartz, as an investment 
pseudomorph of Pearl Spar, or 
Carbonate of Lime, Magnesia, 
and Iron. 
Rcstormel Royal Iron Mine, near 
Lostwithiel, Cornwall. 
The pseudomorphs are here evidence 
of the former existence of carbonates in 
the lode, although no particle of them is 
now to be found. 
478. Iron Pyrites, in rhombo- 
hedral crystals, as an investment 
pseudomorph of Calc Spar. 
Liskeard, E. Cornwall. 
479. Calc Spar, with pseudo¬ 
morphous impressions of crystals 
of Barytes, in which Iron Pyrites 
has crystallized, 
Herodsfoot Mine, near Liskeard. 
480. Pseudomorphous impres¬ 
sions of crystals of Barytes, in 
crystalline Quartz. 
Huel Mary Ann, Cornwall. 
481. Sequence of deposition of 
Quartz, Fluor Sjiar, and Quartz ; 
then removal of Fluor Spar, and 
linally deposition of Zinc Blende. 
Long Cleugh Vein, Aldstone Moor, 
Cumberland. 
Shelf VI. 
482 & 483. Pseudomorphous 
crystals of Quartz, the two speci¬ 
mens fitting each other. 
Consolidated Mines, Gwennap, 
Cornwall. 
484. Octohedral Fluor Spar, 
incrusted with Quartz. 
Consolidated Mines, Gwennap. 
485. Quartz, with Iron Pyrites; 
incrustation of an octohedral crystal 
of Fluor Spar. 
West Caradon Mines, Cornwall. 
486. Quartz, in the form of 
octohedrons of Fluor. 
From the great cross course in 
Holmhush Mine, near Callington, 
Cornwall. 
Presented by W. W. Smyth, F.R.S. 
487. Quartz, which invested 
crystals of Fluor Spar that have 
since disappeared. 
Long Cleugh Vein, Aldstone Moor, 
Cumberland. 
Shelf YU. 
488. Cavernous Quartz, with 
pseudomorphous impressions. 
Bog Mine, Shropshire. 
489. Quartz and Zinc Blende, 
with impressions of Fluor Spar. 
Aldstone Moor, Cumberland. 
490. Incrustation of Fluor 
Spar by Quartz, with subsequent 
disappearance of the Fluor, and 
addition of Zinc Blende. 
Aldstone Moor. 
491. Quartz, pseudomorphous 
after octohedral Fluor Spar. 
Trehane Mine, near Liskeard, 
Cornwall. 
492. Quartz, with pseudo¬ 
morphous cubic impressions. 
Dolcoath Mine, near Camborne, 
Cornwall. 
Presented by the late John Garby. 
