Hermannjahnite (original) (raw)

A valid IMA mineral species

Colour:

white or colourless, sometimes with light greyish, yellowish, greenish or bluish tints

Specific Gravity:

3.74 (Calculated)

Crystal System:

Monoclinic

Name:

Named in honor of Hermann Arthur Jahn (31 May 1907, Colchester, England - 24 October 1979 Southampton, England), mathematical physicist at the Royal Institution and later the University College, Southampton. With Edward Teller, he identified the Jahn–Teller effect, a geometrical distortion of molecules and ions that result from certain electron configurations. It is responsible for a variety of phenomena in spectroscopy and solid-state physics. The Jahn-Teller effect is pronounced in the structure of hermannjahnite.

Co-Type Localities:

ⓘ Naboko cinder cone, Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
ⓘ Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia

The Zn analogue of dravertite. Chemically somewhat similar to christelite and ktenasite, that are hydrated phases.

The structure of hermannjahnite is isotypic to that of dravertite, CuMg(SO4)2, and represents a monoclinically distorted chalcocyanite CuSO4 structure.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:46806:0

69206104-8ee2-47c6-ad72-0a8bf4719839

IMA Classification of HermannjahniteHide

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Type description reference:

Siidra, Oleg I., Nazarchuk, Evgeny V., Agakhanov, Atali A., Lukina, Evgeniya A., Zaitsev, Anatoly N., Turner, Rick, Filatov, Stanislav K., Pekov, Igor V., Karpov, Gennady A., Yapaskurt, Vasiliy O. (2018) Hermannjahnite, CuZn(SO4)2, a new mineral with chalcocyanite derivative structure from the Naboko scoria cone of the 2012–2013 fissure eruption at Tolbachik volcano, Kamchatka, Russia. Mineralogy and Petrology, 112 (1) 123-134 doi:10.1007/s00710-017-0520-4

Classification of HermannjahniteHide

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7.AB.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
B : With medium-sized cations

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of HermannjahniteHide

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Transparency:

Transparent, Translucent

Colour:

White or colourless, sometimes with light greyish, yellowish, greenish or bluish tints

Fracture:

Irregular/Uneven

Density:

3.74 g/cm3 (Calculated)

Optical Data of HermannjahniteHide

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RI values:

_n_α = 1.642(2) _n_β = 1.652(2) _n_γ = 1.675(2)

δ = 0.033

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Pleochroism:

Non-pleochroic

Chemistry of HermannjahniteHide

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Mindat Formula:

CuZn(SO4)2

Crystallography of HermannjahniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 4.8076(2) Å, b = 8.4785(3) Å, c = 6.7648(3) Å
β = 93.041(3)°

Ratio:

a:b:c = 0.567 : 1 : 0.798

Comment:

Space group P21/n.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of HermannjahniteHide

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Co-Type Localities:

ⓘ Naboko cinder cone, Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
ⓘ Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia

General Appearance of Type Material:

isometric anhedral grains up to 0.05 mm across with massive aggregates or crusts up to 2 × 2 mm on basaltic scoria.

Place of Conservation of Type Material:

Type material is deposited in the collections of the Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, specimen no. 19659.

Empirical Formula of Type Material:

Cu1.00(Zn0.43Cu0.31Mg0.25)Σ0.99S2.00O8

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Siidra, O.I., Nazarchuk, E.V., Agakhanov, A.A., Lukina, E.A., Zaitsev, A.N., Turner, R., Filatov, S.K., Pekov, I.V., Karpov, G.A., Yapaskurt, V.O. (2018): Hermannjahnite, CuZn(SO4)2, a new mineral with chalcocyanite derivative structure from the Naboko scoria cone of the 2012–2013 fissure eruption at Tolbachik volcano, Kamchatka, Russia. Mineralogy and Petrology: 112: 123-134.

Synonyms of HermannjahniteHide

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Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Hermannjahnite is soluble in H2O at room temperature and slowly transforms into hydrate in humid air.

Special Storage/
Display Requirements:

Kept in sealed container

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for HermannjahniteHide

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References for HermannjahniteHide

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Reference List:

Siidra, Oleg I., Nazarchuk, Evgeny V., Agakhanov, Atali A., Lukina, Evgeniya A., Zaitsev, Anatoly N., Turner, Rick, Filatov, Stanislav K., Pekov, Igor V., Karpov, Gennady A., Yapaskurt, Vasiliy O. (2018) Hermannjahnite, CuZn(SO4)2, a new mineral with chalcocyanite derivative structure from the Naboko scoria cone of the 2012–2013 fissure eruption at Tolbachik volcano, Kamchatka, Russia. Mineralogy and Petrology, 112 (1) 123-134 doi:10.1007/s00710-017-0520-4

Localities for HermannjahniteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.