Thin Section Thursday! Upper image: XPL. Lower image: Cathodoluminescence. 2.8 Ga tonalite from the Beartooth Mtns, MT with anti-perthitic exsolution of microcline (blue in CL) in a plagioclase host. Contributed by Darrell Henry.
Contact akoziol1 (at) udayton dot edu. #thinsectionthursday

Thin Section Thursday!

Holmquistite in Mica Schist
Crossed polars, horizontal length: 7 mm
Xinjiang, Uygur Autonomous Region
#ThinSectionThursday
You can contribute too. Send images and captions to akoziol1 at udayton dot edu.

Thin Section Thursday:
A. oolite-bearing sample (PPL). B. in (XPL). The sample of black talc is from the late Neoproterozoic Dengying Formation in Guangfeng County, Jiangxi Province, southeastern China. (DOI: dx.doi.org/10.2138/am-2...). Contributed by Huifang Xu.
#thinsectionthursday

Thin Section Thursday! Chalcopyrite in galena (or sunset in a wintery forest, slightly askew), reflected light. Photo by Ingrid Kjarsgaard (c)
You can contribute too! Send image(s) and short caption to akoziol1 (at) udayton dot edu. #thinsectionthursday #galena

T.S. Thursday!
Pyroxene: Murun, Yakutia, Russia. Digitally worked optical photograph inkjet printed on canvas. Contributed by Roger Mitchell.
You can contribute too! Send image(s) and short caption to akoziol1 (at) udayton dot edu. #thinsectionthursday

Thin Section Thursday!
Mica and quartz, XPL. Mica is brightly colored.
Contributed by Bernhard Seubert.
You can contribute too! Send image(s) and short explanation to akoziol1 at udayton dot edu.
#thinsectionthursday

Thin Section Thursday:
Primary Olivine in Picritic Tadipatri Sill, Cuddapah Basin in Eastern Dharwar craton, XPL
Contributed by Dr P V Sunder Raju.
You can contribute too! Send image(s) and short caption to akoziol1 (at) udayton dot edu. #thinsectionthursday