265,000 years old
Lapilli forming around raindrops, lovely image, I didn't know that one
Yes, a very weird rock
Did the Kalsilite crystals form after the initial cooling and solidification of the lava? or was the cooling slow allowing the larger crystals (and texture) to form?
Great question. I infer that it is late-stage igneous, so part of the initial cooling and not later. https://www.degruyter.com/document/doi/10.2478/s13533-012-0190-z/html - is definitely beyond my petrologic pay grade, but I think that's what they say.
Lapilli forming around raindrops, lovely image, I didn't know that one
Yes, a very weird rock
Did the Kalsilite crystals form after the initial cooling and solidification of the lava? or was the cooling slow allowing the larger crystals (and texture) to form?
Great question. I infer that it is late-stage igneous, so part of the initial cooling and not later. https://www.degruyter.com/document/doi/10.2478/s13533-012-0190-z/html - is definitely beyond my petrologic pay grade, but I think that's what they say.