Hermannjahnite

Hermannjahnite is a rare sulfate mineral with the relatively simple formula CuZn(SO₄)₂. It is one of many fumarolic minerals discovered on the Tolbachik volcano.^[2][3]

Hermannjahnite
General
Category	Sulfate
Formula	CuZn(SO4)2
IMA symbol	Hjh[1]
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/n
Unit cell	a = 4.81, b = 8.48, c = 6.76 [Å], β = 93.04° (approximated)
Identification
References	[2]

Relation to other minerals

Hermannjahnite is a zinc-analogue of dravertite – another mineral from prolific Tolbachik.^[4] Minerals somewhat chemically similar to hermannjahnite include ktenasite and christelite.^[5][6]