Maggie Wilson Author

Historical Non-Fiction in Northern Ontario

One Word Photo Challenge: Bronze

Pyrite RamPyrite Ram_010 Pyrite Ram_016 Pyrite Ram_013

This is a pyrite concretion that somewhat fits the colour bronze (bronze-ish?).

It formed in shale from Tea Cove, Newfoundland, Canada.

The ram shape may have formed around a trilobite fossil.

7.5cm x 5.5cm x 2.0cm

More from Wikipedia

A concretion is a hard, compact mass of sedimentary rock formed by the precipitation of mineral cement within the spaces between the sediment grains. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word ‘concretion’ is derived from the Latin con meaning ‘together’ and crescere meaning ‘to grow’. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum.
There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a replacement body.

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Inspired by Jennifer Nicole Wells’  One Word Photo Challenge: Bronze

Categories: Mineral Collecting, Photography

Tags: , , , , , , ,

10 replies

  1. I once had a nautilus in pyrite. The shell was a smooth, shiny gold finish set in the bronze-gravelly pyrite. My brother put it in his collection and it oxidized/disintegrated in just a few years. After almost 600 million years of buried in the Devonian shale it disappeared in less than a decade in the air.

    Liked by 2 people

    • Yes, “pyrite disease” as it’s known in the mineral collection world is a concern, especially if the specimen is kept in a humid environment. It is a bit ironic, isn’t it… 600 million years, minding its own business, then poof iron sulphide dust.

      Liked by 2 people

  2. I always love seeing what you’ll come up with for the challenges. This is a very lovely post. I love the mushroom shape that is formed on the side of the concretion. Thank you for sharing 🙂


  3. That’s an absolutely cool shaped … er …. thingy.

    All I really know about rocks, rock formations, gems, sediments etc., is that I often have rocks in my pockets, and sometimes in my head 😉

    I love reading about the finds — and I love the shape or the ram on this piece. 🙂 Way cool!


  4. Glad you explained it. I thought it was a terrible form of abstract sculpture. Now, I can appreciate it.



  1. One Word Photo Challenge: Bronze | Nola Roots, Texas Heart
  2. One Word Photo Challenge: Chartreuse | Jennifer Nichole Wells

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