Obsidian
Opo Bay, Mayor Island, Bay of Plenty Region, New Zealand
Bands of pale green obsidian in rhyolite from Opo Bay.
"Obsidian varies in colour from black, green, greenish black, brown to grey and is occasionally vesicular or microlitic, or microporphyritic with anorthoclase, aegirine, and aenigmatite microphenocrysts" (Buck et al, 1981)
5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X ...