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Chisholm, Minnesota 55719

(Photos)

Quartz with hematite coatings & inclusions (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA)

Quartz with hematite inclusions (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 1

Quartz with hematite inclusions (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 2

Quartz with hematite inclusions (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 3

Quartz with hematite inclusions (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 4

Quartz with hematite inclusions (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 5

Quartz (hosted in Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 2

Pyrite & iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 1

Pyrite & iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 2

Pyrite & iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 3

Pyrite & iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 5

Pyrite & iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA) 6

Pyrite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; iron mine in Soudan, Minnesota, USA)

Pisolitic bauxite 2

Pisolitic bauxite 4

Hematite (iron ore) (weathered zone in the Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Whiteside Mine, Buhl, Minnesota, USA)

Glen Mine (old iron mine pit in Chisholm, Mesabi Iron Range, Minnesota, USA) 1

Glen Mine (old iron mine pit in Chisholm, Mesabi Iron Range, Minnesota, USA) 2

Jaspilite banded iron formation (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Glen Mine, Chisholm, Minnesota, USA)

Pyrite on quartz 1

Pyrite on quartz 2

Pyrite on quartz 3

Gypsum ("fishtail selenite")

Taconite (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Mesabi Iron Range, Minnesota, USA) 2

Stromatolitic ferruginous chert ("Mary Ellen Jasper") (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Biwabik, Mesabi Iron Range, Minnesota, USA) 1

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