Page:Philosophical Transactions - Volume 001.djvu/352

 of excellent Tin is said to be found in some parts of Cornwall at the Sides and in the Channels of running Waters, which they call; or whether the Ore be of a softer consistence, like Earth or Lome, as there is Lead-ore in Ireland holding store of Silver; and Iron-ore in the North parts of Scotland and elsewhere? And what is observable in it as to Weight, Colour, Mixture, &c.

50. Whether any part of the Metal be found in the Mine perfect and complete? (As I have had presented me good valuable Copper, and pieces of perfect Lead, that were taken up, the one at Jamaica, and the other by an acquaintance of mine, that took them out of the ground himself in New-England.)

51. Whether the Mine affords any parcels of Metal, that seem to grow like Plants (as I have sometimes seen Silver growing, as it seemed, out of Stone, or Sparre almost like blades of Grass; as also great grains of a Metal, which appear'd to me, and which those, that tried some of it, affirmed to be Gold, abounding in a stony lump, that seemed to consist chiefly of a peculiar kind of Sparre.)

52. Whether the Vein lie near, or much beneath the surface of the Earth, and at what depth?

53. Whether the Vein have or have not any particular Concomitants, or Coats (if I may so call them;) and, if any, what they are, and in what order they lie? (As the Veins of Lead-ore, with us, have frequently annext to them a substance call'd Sparre, and next to that another call'd Caulk.

54. Whether (besides these Coats) the Vein have belonging to it any other Heterogeneous substance? (As in Tin-mines we often find that yellow substance, which they call Mundick.)

55. What are the principal Qualities of these Extraneous substances? (As that Sparre is white, but transparent, almost like course Crystall, heavy, britle, easily divisible into flakes &c. Caulk is of a different texture, white, opacous, and like a Stone, but much more ponderous. Mundick I have had of a fine golden colour; but, though it be affirm'd to hold no Metal; yet I found it in weight, and otherwise, to differ from Marchasites; and the Mine-men think it of a poisonous nature.) Rh