001 FOLIATED MAGNETIC PYRITES. ~ 2. Six-sided pyramid, truncated on the extremity. Internally it is splendent, and the lustre is metallic. _ The principal fracture is foliated ; specular-foliated in one direction, less perfect in two other directions, the cross fracture is small conchoidal, inclining to uneven. It occurs in coarse granular distinct concretions. In other characters it agrees with the preceding su - species. Geognostic and Geographic Situations. It occurs in the mines of Andreasberg ; and at Boden- rnais in Bavaria. Observations. 1. It was formerly conjectured, that the non in this species was less oxidised than that in common iron-py- rites, and in this way its magnetic property was accoun - ed for. Mr Hatchett has shewn, however, that iron, when combined naturally or artificially with J of sulphur, is not only still capable of receiving the mag netic fluid, hut is also rendered capable ot -retaining i , so as to become in every respect a permanent magnet; and the same, he thinks, may, in a great measure, be inferred respecting iVon, which has been artificially com bined with 4-O.50 per cent, of sulphur. 2. Mr Hatchett has also shewn that magnetic pyrites agrees in chemical properties with artificial sulphuret ot iron or pyrites. 6. Magnetic