“Typical twinned tridymite on tiny sanidine crystals. Nearly black pseudobrookite is also present. Collection & photo Martin Reich. Nikon D7200, Seiwa M Plan Apo 10x SLWD, DCR 150 reverse, bellows, WeMacro rail. Camera remote with digiCamControl. ZereneStacker (stack of 82 images - DMap).”