Continuing my series where I try to define words of volcanic interest, the new Eruptions Word of the Day is a favorite of mine, mostly because my undergraduate thesis on Vinalhaven Island in Maine ended up dealing with a lot of these types of deposits ... so, without further ado, the word is peperite!
Now, what exactly is a "peperite"?
Well, a picture is worth 1,000 words, right (so that will save me some time):
Peperite in the Vinalhaven Diabase, Vinalhaven Island, Maine. Image by Erik Klemetti. Click on the image to see a larger version.
Let's make some observations:
The rock is full of…
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