Obermamau chalcedony occurrence, Karlstetten, Sankt Pölten-Land District, Lower Austria, Austria
xtl size 2,1 mm; Chris Auer photo and collection (ex J.Metzger coll.)
© AC
Polished section. Coll. & photo Martin Rich.
© Martin Rich
Coll. & Photo Martin Rich. Nikon D5100, Mikro-Nikkor 85 mm 1:3.5 SG. Camera remote with digiCamControl. Combine ZP (stack of 8 images - do stack).
© Takehiro Touge
Pic by G.Knobloch made in 2006
© GK