Akopovaite (original) (raw)

A valid IMA mineral species

About AkopovaiteHide

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Formula:

Al4Li2(OH)12(CO3)(H2O)3

Colour:

white or yellowish

Crystal System:

Monoclinic

Name:

Named after Anna Vartanovna Akopova (Cyrillic: Анна Вартановна Акопова) (b. 1952), a chemistry teacher in the Gymnasium #14, Rostov-on-Don, Russia. Her remarkable style of teaching, including experimental work, inspired many of her students to the choice of the career in the field of Natural Sciences, including the first author of of the type description.

Unique combination of elements. Chemically but not structurally the CO3 analogue of dritsite (not a true analogy). One of the most alkaline lithium minerals.
A synthetic analogue is known.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:53220:4

0fff372a-1718-4d22-aeef-7ec13736edc9

IMA Classification of AkopovaiteHide

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IMA Formula:

Al4Li2(OH)12(CO3)(H2O)3

Type description reference:

Karpenko, Vladimir Yu., Zhitova, Elena S., Pautov, Leonid A., Agakhanov, Atali A., Siidra, Oleg I., Krzhizhanovskaya, Maria G., Rassulov, Victor A., Bocharov, Vladimir N. (2020) Akopovaite, Li2Al4(OH)12(CO3)(H2O)3, a new Li member of the hydrotalcite supergroup from Turkestan Range, Kyrgyzstan. Mineralogical Magazine, 84 (2) 301-311 doi:10.1180/mgm.2020.10

Classification of AkopovaiteHide

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5.DA.55

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : 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 AkopovaiteHide

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Colour:

white or yellowish

Hardness:

VHN1=20 kg/mm2 - Vickers

Density:

2.12(2) g/cm3 (Measured) 2.14 g/cm3 (Calculated)

Chemistry of AkopovaiteHide

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Mindat Formula:

Al4Li2(OH)12(CO3)(H2O)3

Crystallography of AkopovaiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 5.0953(6) Å, b = 8.877(1) Å, c = 7.806(1) Å
β = 102.572(6)°

Ratio:

a:b:c = 0.574 : 1 : 0.879

Unit Cell V:

344.61 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of AkopovaiteHide

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General Appearance of Type Material:

Akopovaite aggregates occur in areas (1–4 cm across) of alteration and (or) leaching of primary pegmatite phosphates. Rosette-like aggregates of akopovaite are composed of pseudohexagonal thin curved plates up to 15-30 μm wide and several μm thick.

Place of Conservation of Type Material:

Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, catalogue #5200/1

Geological Setting of Type Material:

Reference:

Karpenko, V.Y., Zhitova, E.S., Pautov, L.A., Agakhanov, A.A., Siidra, O.I., Krzhizhanovskaya, M.G., Rassulov, V.A. Bocharov, V.N. (2020) Akopovaite, Li2Al4(OH)12(CO3)(H2O)3, a new Li member of the hydrotalcite supergroup from Turkestan Range, Kyrgyzstan. Mineralogical Magazine: 84(2): 301-311.

Synonyms of AkopovaiteHide

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Relationship of Akopovaite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of AkopovaiteHide

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Luminescent with a weak bluish-greenish colour after excitation with a mercury quartz lamp with both shortwave (254 nm) and mediumwave (365 nm) filters and with green
after excitation with a nitrogen laser (λex = 337.1 nm).

Other InformationHide

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Notes:

easily soluble both in concentrated and diluted (up to 0.5 vol. %) HCl and HNO3 followed by the release of CO2.

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 AkopovaiteHide

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References for AkopovaiteHide

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Reference List:

Karpenko, Vladimir Yu., Zhitova, Elena S., Pautov, Leonid A., Agakhanov, Atali A., Siidra, Oleg I., Krzhizhanovskaya, Maria G., Rassulov, Victor A., Bocharov, Vladimir N. (2020) Akopovaite, Li2Al4(OH)12(CO3)(H2O)3, a new Li member of the hydrotalcite supergroup from Turkestan Range, Kyrgyzstan. Mineralogical Magazine, 84 (2) 301-311 doi:10.1180/mgm.2020.10

Localities for AkopovaiteHide

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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.