9/23/2018 12:56:51 PM
|Great pictures Solar, and Thank you Roger for an excellent and thorough explanation. Yes making thin-sections is an art, and micro-bubbles can happen, but I am so glad this is not one of my thin-sections! ;-)
9/23/2018 12:29:13 PM
|Lovely photos * thanks * also for the comments :-)
9/23/2018 8:42:13 AM
|Photo 2 is a radial pyroxene chondrule. It illustrates the crystallization of pyroxene from a point, resulting in a fan-like texture.
It's certainly not a shattercone which is an impactite.
Photo 3 (regarding the annular structures, red arrows).
These are imperfections in the TS. Air microbubbles are inserted below the cover. The microbubble is transparent and does not modify the cross-polarization.
The circles are due to the "vertical" walls of the bubble where refraction phenomena occur, thereby deflacting the light beam.
I personally did observe the same phenomena on some selected TS slides
9/23/2018 7:07:23 AM
|Photo 3 show bubbles on glue between sample and support glass. But that LL3 meteorite is Amazing. Thanks for showing us.
9/23/2018 5:28:22 AM
|Photo 2 shows a perfect radial pyroxene chondrule. Beautiful!