Manganvesuvianite (original) (raw)

A valid IMA mineral species

About ManganvesuvianiteHide

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Formula:

Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]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 although the IMA formula denotes the end-member Y3 site filling as (Al6Mg2), the composition of the most Mn-rich sample reported in Armbruster et al., 2002 (sample NC-14-38) more closely conforms to a Y3 site filling of (Mn3+4Al2Mn2+2).

Colour:

Deep red-brown, red, nearly black

Specific Gravity:

3.404 (Calculated)

Crystal System:

Tetragonal

Name:

Named in 2002 by T. Arbruster, E. Gnos, R. Dixon, J. Gutzmer, C. Hejny, N. Döbelin and O. Medenbach in allusion to the dominance of Mn3+ in the formula and its relationship to vesuvianite. The original "manganvesuvianite" from Harstigen, Langban District, Sweden is discredited as manganoan vesuvianite. The redefined Fe3+ analog of vesuvianite is not found at Langban.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:11475:2

81b4671d-ca37-45ff-a484-6bee7ec60eec

IMA Classification of ManganvesuvianiteHide

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IMA Formula:

Ca19Mn3+Al10Mg2(SiO4)10(Si2O7)4O(OH)9

Type description reference:

Armbruster, T., Gnos, E., Dixon, R., Gutzmer, J., Hejny, C., Döbelin, N., Medenbach, O. (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine, 66 (1) 137-150 doi:10.1180/0026461026610018

Classification of ManganvesuvianiteHide

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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.

Pronunciation of ManganvesuvianiteHide

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Pronunciation:

Physical Properties of ManganvesuvianiteHide

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Transparency:

Transparent, Translucent, Opaque

Colour:

Deep red-brown, red, nearly black

Density:

3.404 g/cm3 (Calculated)

Optical Data of ManganvesuvianiteHide

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RI values:

_n_ω = 1.735 _n_ε = 1.724

δ = 0.012

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

Comments:

O dark red to lilac, E near colorless to yellow;
color zoning correlating to compositional zoning is common

Chemistry of ManganvesuvianiteHide

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Mindat Formula:

Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]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 although the IMA formula denotes the end-member Y3 site filling as (Al6Mg2), the composition of the most Mn-rich sample reported in Armbruster et al., 2002 (sample NC-14-38) more closely conforms to a Y3 site filling of (Mn3+4Al2Mn2+2).

Crystallography of ManganvesuvianiteHide

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Crystal System:

Tetragonal

Class (H-M):

4/m - Dipyramidal

Cell Parameters:

a = 15.575 Å, c = 11.824 Å

Morphology:

Elongated prismatic with dominant {100}, minor {110}, both often with striations, terminated by {101}.

Twinning:

Merohedral {110} twinning

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014562	Manganvesuvianite	Armbruster T, Gnos E, Dixon R, Gutzmer J, Hejny C, Dobelin N, Medenbach O (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa Mineralogical Magazine 66 137-150		2002	Kalahari manganese fields, South Africa	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Comments:

An X-ray powder pattern was not collected on the type material due to strong chemical zoning. It is also noted that manganvesuvianite cannot be distinguished from other vesuvianites on the basis of its X-ray powder pattern.

Geological EnvironmentHide

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Type Occurrence of ManganvesuvianiteHide

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General Appearance of Type Material:

Deep maroon red prisms up to 1.5 cm in length and as rock-forming mineral.

Place of Conservation of Type Material:

The Natural History Museum in Bern, Switzerland, NMBE 35474.

Geological Setting of Type Material:

Hydrothermal alteration (250-400 C) of primary sedimentary and low-grade metamorphic manganese ores.

Associated Minerals at Type Locality:

Reference:

Armbruster, T., Gnos, E., Dixon, R., Gutzmer, J., Hejny, C., Döbelin, N., Medenbach, O. (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine, 66 (1) 137-150 doi:10.1180/0026461026610018

Synonyms of ManganvesuvianiteHide

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Other Language Names for ManganvesuvianiteHide

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Simplified Chinese:锰符山石

Traditional Chinese:錳符山石

Relationship of Manganvesuvianite 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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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 ManganvesuvianiteHide

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References for ManganvesuvianiteHide

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Reference List:

Armbruster, T., Gnos, E., Dixon, R., Gutzmer, J., Hejny, C., Döbelin, N., Medenbach, O. (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine, 66 (1) 137-150 doi:10.1180/0026461026610018

Localities for ManganvesuvianiteHide

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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.