Dymkovite (original) (raw)

A valid IMA mineral species

About DymkoviteHide

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Formula:

Ni(UO2)2(As3+O3)2 · 7H2O

Specific Gravity:

3.806 (Calculated)

Crystal System:

Monoclinic

Name:

Named in honour of the Russian mineralogist Yuriy Maksimovich Dymkov (Юрий Максимович Дымков) (1926-2014), a specialist in U mineralogy, the geology of U deposits, and problems of mineral formation, who was one of the first researchers of the U ores of the Belorechenskoye deposit.

Chemically, dymkovite is a Ni-dominant, almost arsenate-free analogue of seelite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:43272:8

bbf22338-77ae-4be1-a1fb-cbc04017e605

IMA Classification of DymkoviteHide

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Type description reference:

Pekov, Igor V., Levitskiy, Viktor V., Krivovichev, Sergey V., Zolotarev, Andrey A., Chukanov, Nikita V., Bryzgalov, Igor A., Zadov, Aleksandr E. (2012) New nickel-uranium-arsenic mineral species from the oxidation zone of the Belorechenskoye deposit, Northern Caucasus, Russia: II. Dymkovite, Ni(UO2)2(As3+O3)2·7H2O, a seelite-related arsenite. European Journal of Mineralogy, 24 (5) 923-930 doi:10.1127/0935-1221/2012/0024-2219

Classification of DymkoviteHide

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8.E0.

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
0 :

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 DymkoviteHide

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Fracture:

Irregular/Uneven

Density:

3.806 g/cm3 (Calculated)

Comment:

Density could not be measured because of both paucity of available material and lack of heavy liquids of necessary density.

Optical Data of DymkoviteHide

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RI values:

_n_α = 1.625(2) _n_β = 1.735(5) _n_γ = 1.745(3)

2V:

Measured: 20° (10), Calculated: 32°

δ = 0.120

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

Dispersion:

Strong, r > v.

Optical Extinction:

Y ≈ b.

Comments:

X = very pale yellowish-green, Y ≈ Z = light greenish yellow.

Comments:

Absorption: Z >= Y > X.

Chemistry of DymkoviteHide

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Mindat Formula:

Ni(UO2)2(As3+O3)2 · 7H2O

Crystallography of DymkoviteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 17.99(3) Å, b = 7.033(7) Å, c = 6.633(9) Å
β = 99.62(11)°

Ratio:

a:b:c = 2.558 : 1 : 0.943

Morphology:

Lath-shaped to acicular crystals elongated along [010].

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Belorechensk deposit, Russia. Data from the type description.

Geological EnvironmentHide

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Type Occurrence of DymkoviteHide

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General Appearance of Type Material:

Lath-shaped to acicular bright yellow crystals; also light yellow to light greenish-yellow crusts.

Place of Conservation of Type Material:

Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4065/1.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Pekov, I.V., Levitskiy, V. V., Krivovichev, S. V., Zolotarev, A. A., Chukanov, N.V., Bryzgalov, I. A., Zadov, A. E. (2012) New nickel-uranium-arsenic mineral species from the oxidation zone of the Belorechenskoye deposit, Northern Caucasus, Russia: II. Dymkovite, Ni(UO2)2(As3+O3)2·7H2O, a seelite-related arsenite. European Journal of Mineralogy: 24: 923-930.

Synonyms of DymkoviteHide

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Fluorescence of DymkoviteHide

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Other InformationHide

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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 DymkoviteHide

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References for DymkoviteHide

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Reference List:

Pekov, Igor V., Levitskiy, Viktor V., Krivovichev, Sergey V., Zolotarev, Andrey A., Chukanov, Nikita V., Bryzgalov, Igor A., Zadov, Aleksandr E. (2012) New nickel-uranium-arsenic mineral species from the oxidation zone of the Belorechenskoye deposit, Northern Caucasus, Russia: II. Dymkovite, Ni(UO2)2(As3+O3)2·7H2O, a seelite-related arsenite. European Journal of Mineralogy, 24 (5) 923-930 doi:10.1127/0935-1221/2012/0024-2219

Localities for DymkoviteHide

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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.