Pyrite Concretion
- Locale: Dongchuan District, Kuming Prefecture, Yunnan Province, China
- Item #: 5239
- Availability: In Stock
- Weight: 0.00 kg
- L x W x H: 4.00 in x 2.50 in x 2.50 in
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$90.00
Very large concretion with distinct layers of pyrite crystals. How these formed is really unique. Bubbles of HS gas (from rotting organic material in the mud) at the bottom of a sea(later forming black shale) reacted with the iron and solidified in the mud, later to be found as concretions in the black shale. There won't be a lot more of these because they are found only at the exposures on the contact between layers.