Magnesiovesuvianite (original) (raw)

A valid IMA mineral species

Formula:

Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(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.

Crystal System:

Tetragonal

Name:

For the magnesium analog of vesuvianite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:47594:5

2ef2d4c9-8e17-4581-8a73-f2b6f05496d8

IMA Classification of MagnesiovesuvianiteHide

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IMA Formula:

Ca19Mg(Al11Mg)Si18O69(OH)9

Type description reference:

Panikorovskii, T.L., Shilovskikh, V.V., Avdontseva, E.Yu., Zolotarev, A.A., Karpenko, V.Yu., Mazur, A.S., Yakovenchuk, V.N., Bazai, A.V., Krivovichev, S.V., Pekov, I.V. (2017) Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral. Journal of Geosciences, 25-36 doi:10.3190/jgeosci.229

Classification of MagnesiovesuvianiteHide

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9.BG.

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 MagnesiovesuvianiteHide

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Density:

3.30(1) g/cm3 (Measured) 3.35 g/cm3 (Calculated)

Comment:

Measured by flotation in diluted Clerici solution; calculated using the empirical formula

Optical Data of MagnesiovesuvianiteHide

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RI values:

_n_ω = 1.725(2) _n_ε = 1.731(2)

δ = 0.006

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

Comments:

The Gladstone–Dale compatibility index is –0.018 (superior)

Chemistry of MagnesiovesuvianiteHide

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Mindat Formula:

Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(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.

Crystallography of MagnesiovesuvianiteHide

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Crystal System:

Tetragonal

Class (H-M):

4/m - Dipyramidal

Cell Parameters:

a = 15.5362(2) Å, b = 15.5362(2) Å, c = 11.7960(3) Å

Ratio:

a:b:c = 1 : 1 : 0.759

Morphology:

Crystals are elongated along [001]; the dominant forms are {100} and/or {110}, both usually with striation along [001]; crystals are terminated by the {111} and {101} or {001} faces.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

Low temperature hydrothermal solutions poor in iron.

Type Occurrence of MagnesiovesuvianiteHide

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General Appearance of Type Material:

Radiating aggregates up to 2 cm across consisting of acicular tetragonal crystals

Place of Conservation of Type Material:

collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia (catalogue
no. 59783)

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Panikorovskii, T.L., Shilovskikh, V.V., Avdontseva, E.Y., Zolotarev, A.A., Karpenko, V.Y., Mazur, A.S., Yakovenchuk, V.N., Krivovichev, S.V., Bazai, A.V., Krivovichev, S.V., Pekov, I.V. (2017): Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral. Journal of Geosciences, 62, 25-36.

Synonyms of MagnesiovesuvianiteHide

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Relationship of Magnesiovesuvianite to other SpeciesHide

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Other Members of this group:

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 MagnesiovesuvianiteHide

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References for MagnesiovesuvianiteHide

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Reference List:

Panikorovskii, T.L., Shilovskikh, V.V., Avdontseva, E.Yu., Zolotarev, A.A., Karpenko, V.Yu., Mazur, A.S., Yakovenchuk, V.N., Bazai, A.V., Krivovichev, S.V., Pekov, I.V. (2017) Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral. Journal of Geosciences, 25-36 doi:10.3190/jgeosci.229

Panikorovskii, Taras L., Shilovskikh, Vladimir V., Avdontseva, Evgenia Yu., Zolotarev, Andrey A., Pekov, Igor V., Britvin, Sergey N., Hålenius, Ulf, Krivovichev, Sergey V. (2017) Cyprine, Ca19Cu2+(Al,Mg,Mn)12Si18O69(OH)9, a new vesuvianite-group mineral from the Wessels mine, South Africa. European Journal of Mineralogy, 29 (2) 295-306 doi:10.1127/ejm/2017/0029-2592

Localities for MagnesiovesuvianiteHide

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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.