Labuntsovite-Mn (original) (raw)

A valid IMA mineral species - grandfathered

About Labuntsovite-MnHide

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Formula:

Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O

Colour:

Brownish-yellow, bright orange, dark-red

Specific Gravity:

2.89 - 3.02

Crystal System:

Monoclinic

Name:

Originally named labuntsovite after the Russian mineralogists Aleksander Nikolaevich Labuntsov and Ekaterina Eutiikkieva Labuntsov-Kostyleva (for whom the mineral kostylevite is also named). Aleksander Labuntsov had earlier discovered the mineral and described it as titaniferous elpidite. The suffix/modifier was added in 2000.

This is the original labuntsovite. It is now designated labuntsovite-Mn for the dominance of manganese among the divalent cations.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2309:8

a2f67a1b-c669-4cf1-822f-22298a93fc28

IMA Classification of Labuntsovite-MnHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA status notes:

Renamed by the IMA

IMA Formula:

Na4K4Mn2+2Ti8O4(Si4O12)4(OH)4 · 10-12H2O

Approval history:

IMA Case 00–A - Renamed (Grice and Ferraris, 2003).

Classification of Labuntsovite-MnHide

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9.CE.30e

9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions

16.14.8

16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb

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 Labuntsovite-MnHide

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Transparency:

Transparent, Translucent

Colour:

Brownish-yellow, bright orange, dark-red

Cleavage:

Perfect
On (100).

Density:

2.89 - 3.02 g/cm3 (Measured)

Optical Data of Labuntsovite-MnHide

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RI values:

_n_α = 1.684 - 1.695 _n_β = 1.693 - 1.702 _n_γ = 1.792 - 1.814

2V:

Measured: 20° to 44°, Calculated: 30° to 36°

δ = 0.108 - 0.119

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

Optical Extinction:

X = b; Y = c; Z = a.

Comments:

Z = brownish-yellow; X = yellowish.

Chemistry of Labuntsovite-MnHide

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Mindat Formula:

Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O

Common Impurities:

Fe,Mn,Mg,Ca

Crystallography of Labuntsovite-MnHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 14.18 Å, b = 13.70 Å, c = 7.74 Å
β = 117°

Ratio:

a:b:c = 1.035 : 1 : 0.565

Unit Cell V:

1,339.73 ų (Calculated from Unit Cell)

Morphology:

Prismatic crystals. Forms include c{001}, b{010}, m{110}, d{011}, and s{111}.

Crystal StructureHide

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Geological EnvironmentHide

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Type Occurrence of Labuntsovite-MnHide

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General Appearance of Type Material:

Columnar aggregates of brownish-yellow crystals. The crystals are prismatic to 12x3x2 mm.

Place of Conservation of Type Material:

Ecole Nationale Supérieure des Mines, Paris, France, (cotype).
National Museum of Natural History, Washington, D.C., USA, number 113995 (type).
Vernadsky State Geological Museum, Moscow, Russia, number 46311 (type).

Geological Setting of Type Material:

In voids in nepheline syenite.

Associated Minerals at Type Locality:

Synonyms of Labuntsovite-MnHide

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Other Language Names for Labuntsovite-MnHide

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Relationship of Labuntsovite-Mn 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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Other InformationHide

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Thermal Behaviour:

Easily fusible before the blowpipe to a bluish enamel.

Notes:

Dissolves with difficulty in HCl, HNO3, or H2SO4.

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 Labuntsovite-MnHide

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References for Labuntsovite-MnHide

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Localities for Labuntsovite-MnHide

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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.