Gilded Riverbed
December 12, 2014
Here’s another photograph from the archives, taken the same day as the photograph I posted yesterday. The gilt is really schwertmannite overlain with an iridescent film of Leptothrix discophora.
December 12, 2014
Here’s another photograph from the archives, taken the same day as the photograph I posted yesterday. The gilt is really schwertmannite overlain with an iridescent film of Leptothrix discophora.
Romancing Reality 
Gilt indeed.. and another high-quality composition.
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December 14, 2014 at 1:35 PM
Thank you, Andy. I haven’t seen much schwertmannite in the river for a long time. I miss the opportunities it used to give me.
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December 14, 2014 at 2:42 PM
Hi Linda! You have a good eye for creating little universes. I “met” Schwertmannite a few months ago in a river, but now I know thanks to you the origin of the interference color in ponds. I will follow your blog now.
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January 1, 2015 at 6:51 PM
Thank you, Eduardo! I don’t think I’ve ever met anyone—besides the person who told me about it—who has seen schwertmannite except in my photographs! Glad to have given you a clue about the interference colors in ponds as well as along slow-moving rivers and in bog areas—even in gutters and parking lots! The Leptothrix discophora biofilm in the parking lot of my gym here in urban Sarasota last week was the most surprising. At first I was sure it was an oil slick from gasoline leaking from a car, but it fractured rather than flowed back together when I disturbed it. It was a rainy day, and I guess the rain washed some iron-bearing ground water into the parking lot.
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January 1, 2015 at 8:44 PM