Nyerereite (original) (raw)

A valid IMA mineral species

About NyerereiteHide

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Crystal System:

Orthorhombic

Name:

Named by C. Milton in 1968 in honour of Julius Kambarage Nyerere (13 April 1922, Butiama, Tanganyika – 14 October 1999, London, United Kingdom), president of Tanganyika and then Tanzania 1964-1985. The original description contained only a name and composition. A later proposed name of natrofairchildite (in another paper that included data) was denied and nyerereite was given priority.

May be "a possible messenger from the deep Earth" (Zucchini et al., 2022).

May occur as fluid inclusions in chromite (Potapov et al., 2022).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2945:8

013caf4b-b8b0-4474-964b-beaf677e2f8f

IMA Classification of NyerereiteHide

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Classification of NyerereiteHide

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5.AC.10

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
C : Alkali and alkali-earth carbonates

14.3.4.1

14 : ANHYDROUS NORMAL CARBONATES
3 : A2B(XO3)2

11.1.10

11 : Carbonates
1 : Carbonates of the alkali metals and ammonium

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 NyerereiteHide

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Density:

2.41 g/cm3 (Measured) 2.42 g/cm3 (Calculated)

Optical Data of NyerereiteHide

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RI values:

_n_α = 1.511 _n_β = 1.533 _n_γ = 1.535

2V:

Measured: 29° , Calculated: 28°

δ = 0.023

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

Optical Extinction:

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

Chemistry of NyerereiteHide

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Mindat Formula:

Na2Ca(CO3)2

Crystallography of NyerereiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 5.062(1) Å, b = 8.790(1) Å, c = 12.744(1) Å

Ratio:

a:b:c = 0.576 : 1 : 1.45

Unit Cell V:

567.04 ų (Calculated from Unit Cell)

Morphology:

Platy crystals to 0.5 mm. Flat tabular with {001} faces well developed and no proper faces in the [001] zone. Sometimes displaying “swallow-tail” terminations.

Comment:

Incommensurately modulated twin structure (Bolotina et al., 2017): Cmcm(α00)00s with modulation vector q = 0.383a*, with above unit-cell parameters. Originally assumed to have Cmc21. The structure of nyerereite was refined as a three-component twinned structure in the centrosymmetric Pbca space group with ratios of the three twinning components 0.221(3):0.287(3):0.492(3)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of NyerereiteHide

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General Appearance of Type Material:

Invariably twinned crystals, embedded in rock.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 113544, 162608.

Geological Setting of Type Material:

Synonyms of NyerereiteHide

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Other Language Names for NyerereiteHide

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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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Health Risks:

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

Nyerereite in petrologyHide

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An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

• Igneous rock
  • Exotic crystalline igneous rock
    * Carbonatite
    * Natrocarbonatite

Internet Links for NyerereiteHide

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References for NyerereiteHide

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Reference List:

Shatskiy, A., Gavryushkin, P.N., Litasov, K.D., Koroleva, O.N., Kupriyanov, I.N., Borzdov, Y.M., Sharygin, I.S., Funakoshi, K., Palyanov, Y.N., Ohtani, E. (2015) Na-Ca carbonates synthesized under upper-mantle conditions: Raman spectroscopic and X-ray diffraction studies. European Journal of Mineralogy: 27: 175-184.

Bolotina, N.B., Gavryushkin, P.N., Korsakov, A.V., Rashchenko, S.V., Seryotkin, Y.V., Golovin, A.V., Moine, B.N., Zaitsev, A.N., Litasov, K.D. (2017) Incommensurately modulated twin structure of nyerereite Na1.64K0.36Ca(CO3)2. Acta Crystallographica B: 73: 276-284.

Zucchini, A., Gavryushkin, P. N., Golovin, A. V., Bolotina, N. B., Stabile, P., Carroll, M. R., ... & Medrish, I. V. (2022). Crystal structure of nyerereite: A possible messenger from the deep Earth. American Mineralogist, 107(11), 2054-2064.

Potapov, S.V., Sharygin, I.S., Konstantinov, K.M., Danilov, B.S., Shcherbakov, Yu.D., Letnikov, F.A. (2022): Melt Inclusions in Chromium Spinel of Kimberlites of the Zapolyarnaya Pipe, Upper Muna Field, Siberian Craton. Doklady Earth Sciences: 504: 271–275.

Localities for NyerereiteHide

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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.