I live in the Sierra Nevadas, a little over 8,000 feet up. There's an area in my yard that has rocks with a bright shiny sheen to them. I've seen some kind of coating on nearby plants (which doesn't seem to harm them), which I'm guessing is maybe the same thing.
- It's a ~30 square foot area.
- Rain, shine, cold, hot: it always looks the same.
- It's not wet to the touch and doesn't rub off easily.
- If I flip a rock over (shown), the part in the dirt doesn't have the sheen.
- It doesn't really make the rocks very slippery; not anymore than normal.
My question: what the heck is on my rocks (and plants)? I've attached a picture looking up. There's a regular douglas fir and a residential power line, but there are powerlines all over the neighborhood and douglas firs all over the yard: this doesn't show up anywhere else. And a big area of the sheen just has blue sky overhead.
Example shiny sheen rock. The bottom of a nearby rock laid up against it.
Shiny part on right (that was exposed to the air), dull part on left that was in the dirt.
Not sure if it's the same stuff, but this residue is on the plants in the affected area.
I went into the middle of the area and snapped a picture looking straight up. Residential powerline overhead (~30' up), standard issue douglas firs nearby.