Sedimentary Rocks

Banded Iron Formation

Hardness: ≈5.5–7 Approximate

Banded iron formation is a Precambrian sedimentary rock of alternating iron‑rich layers (hematite or magnetite) and silica (chert), typically showing red and...

Breccia

Hardness: ≈2–7 Approximate

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Chert

Hardness: 7

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Conglomerate (Puddingstone)

Hardness: ≈2–7 Approximate

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Limestone

Hardness: 3

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Sandstone

Hardness: ≈6–7 Approximate

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Shale

Hardness: ≈3 Approximate

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