Forsterite
Hoshu Mine, Mt Posyu, Taesil-li, Puktuil-myon, Tanchon City, South Hamgyong Province, North Korea
Forsterite crystals, apparently etched out of marble, from Hoshu mine, South Hamgyong, North Korea, collected during early WWII by Otokichi Nagashima. Crystal in lower center part of photo is 1.25cm long.
© Alfredo Petrov