KeywordsArizona Geological Survey Bulletins
United States of America
MetadataShow full item record
PublisherUniversity of Arizona Bureau of Mines
DescriptionWith the exception of aluminum, iron is the most abundant metallic element constituting the earth's crust. According to Clarke, the average of analyses of igneous rocks made in the laboratories of the United States Geological Survey showed 4.47 per cent iron. It occurs in nature native and in many compounds, giving rise to numerous minerals. Its most important ores are hematite, limonite, magnetite, and siderite. Goethite and turgite are commercially included with limonite under the name of brown hematite. 13 p.
Series/Report no.Bulletin No. 43
Mineral Technology Series No. 15