Oxygenized Tin

The figures here represented approach the dodecaëdron as nearly as any that I have yet met with British origin. It will be readily seen that the edges of the four-side pyramid, as truncated on the left-hand figure, if continued so as to obliterate the octaëdral faces, would form, with the help of the four-sided column, eight of the faces of the dodecaëdron, the four faces being hid in the gangue; and, if with a short column, the faces would be all rhomboidal; but if the column be long, the columnar faces will be hexagonal. As yet we have not seen a dodecaëdron with both pyramids complete. These specimens are not so black as most, an are modified very roughly. They have also somewhat of a rusty ochraceous hue, probably holding more oxidated iron than usual.

We are obliged for this specimen to our friend Mr. Richard Philips. We have some like it, but much smaller.