Tranquillityite (original) (raw)

A valid IMA mineral species

About TranquillityiteHide

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Formula:

(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12

Colour:

gray, Dark red-brown

Specific Gravity:

4.7 (Calculated)

Name:

Named in 1971 by J. F. Lovering, D. A. Wark, A. F. Reid, N. G. Bunch, A. El Goresy, Paul Ramdohr, G. M. Brown, A. Peckett, R. Phillips, Eugene N. Cameron, J. A. V. Douglas, and A. G. Plant after its discovery locality at the Sea of Tranquility, the Moon.

Lunar rock samples brought back from the Moon by the Apollo 11 mission in 1969 were found to contain three minerals that had never been seen on Earth. Terrestrial occurrences for pyroxferroite and armalcolite were discovered in the next few years, but until 2011, tranquillityite was only known from returned moon rock samples and from lunar and martian meteorites. However, the mineral has now been discovered as an uncommon accessory phase in terrestrial mafic rocks, at six localities in Western Australia. [http://geology.gsapubs.org/content/40/1/83.abstract]

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4006:4

8f99ccc3-fae6-4ea4-b257-e83cc58fe9a0

IMA Classification of TranquillityiteHide

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IMA Formula:

Fe2+8Ti3Zr2Si3O24

Type description reference:

Lovering J F, Wark D A, Reid A F, Ware N G, Keil K, Prinz M, Bunch T E, El Goresy A, Ramdohr P, Brown G M, Peckett A, Phillips R, Cameron E N, Douglas J A V, Plant A G (1971) Tranquillityite: a new silicate mineral from Apollo 11 and Apollo 12 basaltic rocks. Proceedings of the Second Lunar Science Conference 1, 39-45

Classification of TranquillityiteHide

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9.AG.90

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination

78.7.16.1

78 : Unclassified Silicates
7 :

14.10.33

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

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 TranquillityiteHide

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Transparency:

Translucent, Opaque

Colour:

Gray, Dark red-brown

Density:

4.7(1) g/cm3 (Calculated)

Optical Data of TranquillityiteHide

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δ = 2.120

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

Anisotropism:

weakly anisotropic

Colour in reflected light:

grey

Pleochroism:

Non-pleochroic

Chemistry of TranquillityiteHide

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Mindat Formula:

(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12

Common Impurities:

Hf,Al,Cr,Nb,Nd,Mn,Ca

Crystallography of TranquillityiteHide

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Cell Parameters:

a = 11.69(5) Å, c = 22.25(10) Å

Unit Cell V:

2,633.24 ų (Calculated from Unit Cell)

Comment:

Point Group: n.d.; Space Group: n.d.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of TranquillityiteHide

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General Appearance of Type Material:

thin laths and sheaves of laths

Place of Conservation of Type Material:

The Lunar Science Institute, Houston, Texas

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Lovering, J.F., Wark, D.A., Reid, A.F., Ware, N.G., Keil, K., Prinz, M., Bunch, T.E., El Goresy, A., Ramdohr, P., Brown, G.M., Peckett, A., Phillips, R., Cameron, E.N., Douglas, J.A.V., Plant, A.G. (1971) Tranquillityite: a new silicate mineral from Apollo 11 and Apollo 12 basaltic rocks. Proceedings of the Second Lunar Science Conference: 1: 39-45.

Synonyms of TranquillityiteHide

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Other Language Names for TranquillityiteHide

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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.

Internet Links for TranquillityiteHide

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References for TranquillityiteHide

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Reference List:

Lovering J F, Wark D A, Reid A F, Ware N G, Keil K, Prinz M, Bunch T E, El Goresy A, Ramdohr P, Brown G M, Peckett A, Phillips R, Cameron E N, Douglas J A V, Plant A G (1971) Tranquillityite: a new silicate mineral from Apollo 11 and Apollo 12 basaltic rocks. Proceedings of the Second Lunar Science Conference 1, 39-45

Localities for TranquillityiteHide

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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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