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I think that's hoarfrost when the ice crystalizes like that. Cool stuff.The toe of a glacier touching the water on a remote Artic Coast.
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Just Kidding. [emoji14] Actually some interesting ice crystals I noticed in a stream on a walk around the farm this weekend.
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Super close up view.
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A weekend warmup was literally causing the crystals to melt as I was looking at them.
Looks like wonderstone, a welded-vitric tuff (vitric means glassy) of rhyolitic composition. Circulating ground water produces the colorful banding. The maroon and yellow-brown colors are due to the presence of iron oxides. Not petrified wood. Rhyolite is magma with high silicate composition (75% typically) and is what causes continental volcanoes to explode (basalt is non-explosive and indicative of oceanic magma). Probably way more than you wanted to know.