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