1501 Hypersthene (probably enstatite), and magnetite, from Mount Tarawera, Okataina, Rotorua District, Bay of Plenty Region (Te Moana-a-Toi), North Island, New Zealand. Photo width is 3.33mm and a 46 photo stack.
Mount Tarawera last erupted in 1886 and was responsible for killing around 120 people, and destroying the famous Pink and White Terraces. It was a very explosive eruption as is evident in the Bing satellite map below.