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Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock that are almost always of Precambrian age2.1 billion year old banded iron formation

Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock that are almost always of Precambrian billion year old banded iron formation

A piece of a banded iron formation, a type of rock that consists of alternating layers with iron(III) oxide (red) and iron(II) oxide (grey). BIFs were mostly formed during the Precambrian, when the atmosphere wasn't yet rich in oxygen. Moories Group, Barberton Greenstone Belt, South Africa.

A piece of a banded iron formation, a type of rock that consists of alternating layers with iron(III) oxide (red) and iron(II) oxide (grey).

Near the Soudan Underground State Park administered by the Minnesota Department of Natural Resources. This is a pavement outcrop of folded banded iron formation.  The outcrop consists of metallic hematite, red jasper and white chert.  These originally horizontal layers have been folded multiple times.  In some areas, the jasper and chert have fractures filled with milky quartz.

Minnesota, this is a pavement outcrop of folded banded iron formation of metallic hematite, red jasper & white chert

A new explanation for banded iron formations (BIFs)

A new explanation for banded iron formations (BIFs)

http://geology.about.com/od/rocks/ig/sedrockindex/rocpiclimestone.htm

What Are the 25 Types of Sedimentary Rock?

Limestone is the state stone of Illinois and the state rock of Tennessee. Limestone is both a building stone and a source of industrial lime, used in cement!

Tiger Iron Eye stone / South Africa /Tiger eye is found on plateau's in africa

For some strange reason, I like it: Tiger Iron Eye stone / South Africa

Stromatolite  - Stromatolites are layered accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (blue-green algae). Stromatolites provide the most ancient records of life on Earth by fossil remains which date from more than 3.5 billion years ago.

Stromatolite Stromatolites are layered accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially.

Marcasite [FeS2]. Sedimentary, hydrothermal, and secondary mineral

Marcasite: providing a psychic shield, this stone cleanses, brings forth metaphysical abilities, and heightens spiritual awareness; can also be pivotal in removing negative energy or entities from a dwelling

Dufrenite - Iron Monarch Quarry, Iron Knob, South Australia, Australia

Dufrenite - Iron Monarch Quarry, Iron Knob, South Australia, Australia Pins from Pohlian Lim .

Incredible gneiss from Jotun Nappe in the Norwegian Caledonides

ptygmatic folds in gneiss - (migmatite) Jotun Nappe - Caledonides of southern Norway G

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