Manaevite-(Ce) (original) (raw)

A valid IMA mineral species

About Manaevite-(Ce)Hide

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Formula:

(Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9

The formula is a partial simplification of the full structural formula. The large (VII-IX)-coordinated (X4)2(X3)8(X2)8(X1) sites are here combined (e.g. Ca19) and are typically filled with Ca, although other large cations such as the REE may be present. The square-pyramidal Y1 site can host a variety of M2+ and M3+ ions and is the basis for the distinction of several species. The VI-coordinated Y2 site typically is filled with Al, whereas the also VI-coordinated Y3 site may contain Al, Mg, and other cations of similar charge and size. The tetrahedral T1 site is typically vacant but may contain B (less commonly Al); the trigonal T2 site is also typically vacant but may also contain B. Some of the (SiO4) may be replaced by (H4O4), akin to the Si4+ ↔︎ 4H+ hydrogarnet substitution. Among the oxygen that are not part of the silica tetrahedra, there are eight "O11" that typically occur as OH, two "O10" that are typically O & OH or OH & OH (the latter arrangement notably when Y1 is an M2+ cation). There may also be up to three "O12" that in most vesuvianite-group minerals are absent (and are not included here), but may be present particularly when T1 is occupied.

Note that in lieu of published structural data, the Y2 and Y3 site occupancies denoted here are distributed as per other members of the other vesuvianite group minerals (i.e. Y2 = Al-dominant; Ti & Fe3+ assigned to Y3). These occupancies may be re-assigned with updated data. Justification for the -(REE) suffix is that REE (in this case predominately Ce) is the dominant cation in the X3 site.

Crystal System:

Tetragonal

Name:

The new mineral is named in honor of Nikolay Mikhailovich Manaev (27.02.1936–02.03.2012), a former chief geologist of the Kovdorslyuda Mining and Dressing Company and a prominent mineral collector, for his contribution to the geology, mineralogy and exploitation of the world-largest Kovdor phlogopite deposit, Kola Peninsula, Russia.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:53139:3

43cb7581-09d9-4f79-980c-aa22ea8ee18b

IMA Classification of Manaevite-(Ce)Hide

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IMA Formula:

Ca11(Ce,H2O,Ca)8Mg(Al,Fe)4(Mg,Ti,Fe3+)8[Si2O7]4[(SiO4)8(H4O4)2](OH)9

Classification of Manaevite-(Ce)Hide

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9.BG.35

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

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 Manaevite-(Ce)Hide

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Fracture:

Irregular/Uneven, Conchoidal

Density:

3.80(3) g/cm3 (Measured) 3.72 g/cm3 (Calculated)

Optical Data of Manaevite-(Ce)Hide

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RI values:

_n_ω = 1.760(5) _n_ε = 1.750(5)

δ = 0.010

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

Dispersion:

strong dispersion

Comments:

[O (light yellowish-brown) < E (brown)]

Comments:

Sometimes slightly biaxial(2 V = 0°–5°)

Chemistry of Manaevite-(Ce)Hide

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Mindat Formula:

(Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9

The formula is a partial simplification of the full structural formula. The large (VII-IX)-coordinated (X4)2(X3)8(X2)8(X1) sites are here combined (e.g. Ca19) and are typically filled with Ca, although other large cations such as the REE may be present. The square-pyramidal Y1 site can host a variety of M2+ and M3+ ions and is the basis for the distinction of several species. The VI-coordinated Y2 site typically is filled with Al, whereas the also VI-coordinated Y3 site may contain Al, Mg, and other cations of similar charge and size. The tetrahedral T1 site is typically vacant but may contain B (less commonly Al); the trigonal T2 site is also typically vacant but may also contain B. Some of the (SiO4) may be replaced by (H4O4), akin to the Si4+ ↔︎ 4H+ hydrogarnet substitution. Among the oxygen that are not part of the silica tetrahedra, there are eight "O11" that typically occur as OH, two "O10" that are typically O & OH or OH & OH (the latter arrangement notably when Y1 is an M2+ cation). There may also be up to three "O12" that in most vesuvianite-group minerals are absent (and are not included here), but may be present particularly when T1 is occupied.

Note that in lieu of published structural data, the Y2 and Y3 site occupancies denoted here are distributed as per other members of the other vesuvianite group minerals (i.e. Y2 = Al-dominant; Ti & Fe3+ assigned to Y3). These occupancies may be re-assigned with updated data. Justification for the -(REE) suffix is that REE (in this case predominately Ce) is the dominant cation in the X3 site.

Crystallography of Manaevite-(Ce)Hide

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Crystal System:

Tetragonal

Class (H-M):

4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal

Cell Parameters:

a = 15.9247(13) Å, c = 11.9661(10) Å

Unit Cell V:

3,034.56 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 Manaevite-(Ce)Hide

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Place of Conservation of Type Material:

Collections of the (1) Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5075/1; (2) the Mineralogical Museum of St. Petersburg State University, St. Petersburg, Russia, registra

Geological Setting of Type Material:

skarn-like metasomatic rock

Synonyms of Manaevite-(Ce)Hide

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Relationship of Manaevite-(Ce) to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Manaevite-(Ce)Hide

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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 Manaevite-(Ce)Hide

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References for Manaevite-(Ce)Hide

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Reference List:

Moiseev, Mikhail M., Panikorovskii, Taras L., Aksenov, Sergey M., Mazur, Anton S., Mikhailova, Julia A., Yakovenchuk, Victor N., Bazai, Ayya V., Ivanyuk, Gregory Yu., Agakhanov, Atali A., Shilovskikh, Vladimir V., Pekov, Igor V., Kasatkin, Anatoly V., Rusakov, Vyacheslav S., Yapaskurt, Vasiliy O., Karpenko, Vladimir Yu., Krivovichev, Sergey V. (2020) Insights into crystal chemistry of the vesuvianite-group: manaevite-(Ce), a new mineral with complex mechanisms of its hydration. Physics and Chemistry of Minerals, 47 (3) doi:10.1007/s00269-020-01086-7

Localities for Manaevite-(Ce)Hide

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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.