Very rich specimen loaded with yellowish brown to colorless crystals in cavaties of scoria from the Tolbachik. This is a specimen from the research collection of Dr. Igor Pekov, when he described the mineral.
The more exact locality is:
Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough), Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
XRD Confirmed, EDS Confirmed, Type & Only Locality, Author's Material, New IMA