For citations:
Sandalov F.D., Schipalkina N.V., Pekov I.V., Koshlyakova N.N., Britvin S.N., Sidorov E.G. Cristobalite and tridymite from deposits of the Arsenatnaya fumarole (Tolbachik volcano, Kamchatka, Russia). Moscow University Bulletin. Series 4. Geology. 2021;1(2):87-96. (In Russ.) https://doi.org/10.33623/0579-9406-2021-2-87-96