16 
TIN OEES. 
Shelf VI. 
Fahlerz, (Tetrahedrite,) an 
ore very variable in composition, 
containing from 30 to 40 per cent, 
of copper, combined with sulphur, 
antimony, arsenic, zinc, iron, and 
often a very notable amount of 
silver or of mercury ; little known 
in England, but an important ore 
in Saxony, Hungary, Bohemia, &c. 
348. Fahlerz coated with cop¬ 
per pyrites, and associated with 
argentiferous Galena. 
Herodsfoot Mine, Liskeard. 
349. Fahlerz, crystallized in 
tetrahedrons, but disguised under 
a coating of iron pyrites. 
Great Crinnis Mine, St. Blazey, 
Cornwall. 
350. Fahlerz, argentiferous, 
well crystallized in tetrahedrons. 
Great Crinnis Mine, St. Blazey, 
Cornwall. 
S51. Fahlerz, and galena, 
crystallized ; the Fahlerz crystals 
alone being invested with a coat¬ 
ing of crystallized copper pyrites. 
Near Liskeard, Cornwall. 
Bournoxite, Endellionite, {an 
timonio-sulphide of lead and 
copper). 
352. Bournonite. 
Near Liskeard, Cornwall. 
353. Bourxonite, well crystal¬ 
lized, partly incrusted with quartz. 
Near Liskeard, Cornwall. 
354. Bournonite, crystallized 
with very brilliant facets, upon 
crystallized quartz, 
Herodsfoot, near Liskeard. 1859. 
Shelf VII. 
355 to 359. Copper Pyrites 
continued; large specimens exter¬ 
nally tarnished, and iridescent. 
From Knockmahon, Ireland. 
Shelf VIII. 
360 to 362. Large specimens of 
Copper Pyrites. 
From the lode at Vigra Mine, near 
Dolgelly, Merionethshire, North 
Wales. 
Presented by J. Harvey. 
t 
Wall Case 8. 
Tin Ore. 
Cassiterite, Tin-stone, or Tin ore, {Oxide of Tin), contains tin, 
78*62 ; oxygen, 21*38. The metal tin is extracted from this one 
species of ore only, which has not been found in remunerative quantity 
in any other part of the kingdom than Cornwall and Devon. In those 
western counties it has been known and worked from remote antiquity, 
whilst the ores of copper were neglected till within a recent period. 
The tin ore when dressed or prepared for the smelter is termed 
black tin, and the metal produced by smelting, ivhite tin. 
About 170 mines in Cornwall and Devon yield tin ores, and the 
total quantity of metallic tin produced from them in 1863 was 10,006 
tons, of the value of 1,170,702/. 
Shelf I. 
363. Cassiterite, crystallized 
and massive. 
Bosorne Mine, St. Just, Cornivall. 
364to 366. CASSiTERiTE,massive. 
From the Mines of Botallack and 
Balleswidden, St. Just. 
7 f 
368. Cassiterite. 
Balnoon Mine, St. Ives, Cornwall. 
369. Cassiterite, crystalline, 
and massive. 
Providence Mine, St. Ives, 
Prom the Exhibition of 1851. 
367. Cassiterite, very rich 
sample, crystallized and massive. 
Huel Owles, St, Just. 
370. Cassiterite (Tin-stone, 
or tin ore). 
Cornwall. 
