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Formula: CuZn(SO4)2
Sulphate
Crystal System: Monoclinic
Specific gravity: 3.74 calculated
Colour: white or colourless, sometimes with light greyish, yellowish, greenish or bluish tints
Solubility: soluble in H2O at room temperature and slowly transforms into hydrate in humid air.
Environments
Hermannjahnite is a relatively new mineral, approved in 2015 and to date (May 2024) reported only from
the Tolbachik Volcanic Field.
Localities
There are two co-type localities, the Naboko cinder cone, and the Arsenatnaya fumarole, Second scoria cone,
Northern Breakthrough, both at the Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia.
At the type localities hermannjahnite occurs as isometric anhedral grains up to 0.05 mm across with massive
aggregates or crusts up to 2 × 2 mm on basaltic
scoria in sublimates of fumaroles. Associated minerals include
tenorite, langbeinite,
hematite, fedotovite,
euchlorine, dravertite,
dolerophanite,
chalcocyanite,
aphthitalite and anhydrite
(Mindat).
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