41. Pyrite with chalcopyrite and gold occupies quartz veins as blebs and small veins.42. Other component minerals as dolomite, silicate and traces of graphite and pyrite . 43. The mine also bore other minerals including chalcedony, opal, and pyrite . 44. Between Bonao and Maimon, supergene zone containing pyrite , chalcopyrite, and sphalerite. 45. The ferric cations produced can also oxidize additional pyrite and reduce into ferrous ions: 46. This disintegration of marcasite in mineral collections is known as " pyrite decay ". 47. At Easington in 1951 blunt picks hit a patch of pyrites and generated sparks. 48. The pyrite concretions typically are about 30 cm ( 1 foot ) in diameter. 49. They are hard, dense purple-black rocks with considerable content of pyrite . 50. The island's orebody was chiefly pyrite .
