The #ThinSectionThursday tradition has been very quiet of late. I'm going to try to get back to tooting something every week...
This looks like a shitstorm of stuff flying over the battlements of some dark fortress.
The "stuff" = mullite crystals. The white sky = plagioclase, the battlements = dendritic plagioclase crystallites, & darkness = glass. FOV ~2mm wide. Plane polarized light illumination.
The rock is an aluminous xenolith from the Rubh a' Chromain sill, Mull. #Geology #Mull