LinnyMan sent this to me without any annotations or speculation on what it is. When I first looked at it, I thot fulgurite, but all fulgarite I’ve seen has gritty texture and tubular shape. Altho this gritty one side, and porous like scoria, other side smooth bubbles, and kinda like botryoidal chalcedony:
Here’s a picture of “regular” (is there such a thing!?) fulgurite from Texas (https://tpwd.texas.gov/state-parks/m...acts/fulgurite), and one of an “exogenic ” for sale Worthpoint:
The difference is where the minerals melted by lightening cool. Instead of both heating and cooling in the ground, the melting exogenic’s material is thrown into the air where it solidifies again. Hence the name “exogenic” (outside, external). Is that not just one of the coolest/hottest/coolest things ever?!
Here’s a picture of “regular” (is there such a thing!?) fulgurite from Texas (https://tpwd.texas.gov/state-parks/m...acts/fulgurite), and one of an “exogenic ” for sale Worthpoint:
The difference is where the minerals melted by lightening cool. Instead of both heating and cooling in the ground, the melting exogenic’s material is thrown into the air where it solidifies again. Hence the name “exogenic” (outside, external). Is that not just one of the coolest/hottest/coolest things ever?!
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