Where is Pyrite Concretion found?

Pyrite Concretion occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.

Where to find Pyrite Concretion

Collecting tips

1. Look in Shale and Mudstone Outcrops. Concretionary pyrite is typically found embedded within dark, fine-grained sedimentary rocks. Examine weathered outcrops where concretions may have eroded out or are visible on exposed surfaces.
2. Search for Anoxic Environments. Focus on geological formations that indicate ancient anoxic conditions, such as black shales, coal-bearing strata, or areas with abundant fossilized organic matter.
3. Check for Associated Fossils. Pyrite concretions often form around organic nuclei, so they can be found associated with or even encasing fossils (e.g., ammonites, bivalves, plant remains).
4. Use a Geologist's Hammer and Chisel. Carefully extract concretions from the host rock. They are often harder than the surrounding sediment, making them stand out.
5. Be Aware of Oxidation. Freshly exposed pyrite can oxidize rapidly, especially in humid conditions, leading to the formation of sulfuric acid and iron oxides. Store specimens in dry, stable environments.

Quick Check

Color:

Brassy yellow to golden metallic

Luster:

Metallic

Streak:

Greenish-black to brownish-black

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