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Megaspherulite growth

Earth Science Asked on April 23, 2021

I have been fascinated by photos of these for a while, and I would like to ask how megaspherulites grow so large, when spherulites are normally quite small?

I also noticed that all papers about the formation of megaspherulites I could find (such as this one) seem to say that they form in rhyolitic vitrophyre.

Why do they only form in rhyolitic vitrophyre?

megaspherulite photo

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