just a weird rock

[rockpassion]

found this weird rock which has what looks like a outer crust and a very busy interriour. Anyone that knows what it is?

 

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[rockpassion]

here is a closeup of a fresh break

 

[tamrock]

I'm thinking Rhyolite to start with.

Rhyolite: An extrusive igneous rock. Photos and definition.

Rhyolite is an extrusive igneous rock formed during eruptions of granitic magma. Pumice, obsidian, and tuff are associated rock types.

geology.com

 

[rockpassion]

here the rock after cleaning.

 

[rockpassion]

melt inclusion on the partial crust