Fluorvesuvianite (original) (raw)

A valid IMA mineral species

About FluorvesuvianiteHide

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Formula:

Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,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.

As it is not explicit if all "O11" sites can be occupied by F in the ideal end-member, the use of (F,OH) is retained here.

Colour:

colourless to white

Crystal System:

Tetragonal

Name:

For its relation to vesuvianite and the fluoride dominance over hydroxide in its chemical composition.

Fluorine analogue of Vesuvianite.

"The structure refinement demonstrates that most of the fluorine is at the F(11) position [the refined site-occupancy is F0.72(OH)0.28]. The elongate bond length (1.664 Å) and the Si(1) site-occupancy factor, 0.803(8), suggest substitution according to the scheme (SiO4)4− <-> 4F−.
If Ca19(Al,Mg,Fe2+)13[SiO4]10[Si2O7]4O(OH)9 is considered the formula of vesuvianite, the end-member composition of fluorvesuvianite is Ca19(Al,Mg,Fe2+)13[SiO4]10[Si2O7]4O(F)9. In other words, a vesuvianite-group specimen with more than 4.5 F apfu is named fluorvesuvianite." (Britvin et al., 2003).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:25683:6

2a1b074c-3d09-4508-af57-ab42ad63639b

IMA Classification of FluorvesuvianiteHide

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IMA Formula:

Ca19(Al,Mg)13(SiO4)10(Si2O7)4O(F,OH)9

Type description reference:

Britvin, S. N., Antonov, A. A., Krivovichev, S. V., Armbruster, T., Burns, P. C., Chukanov, N. V. (2003) Fluorvesuvianute, Ca19(Al,Mg,Fe2+)13[SiO4]10[Si2O7]4O(F,OH)9, a new mineral species from Pitkaranta, Karelia, Russia: Description and crystal structure. The Canadian Mineralogist, 41 (6) 1371-1380 doi:10.2113/gscanmin.41.6.1371

Classification of FluorvesuvianiteHide

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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.

Physical Properties of FluorvesuvianiteHide

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Colour:

Colourless to white

Density:

3.43 g/cm3 (Measured) 3.40 g/cm3 (Calculated)

Optical Data of FluorvesuvianiteHide

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RI values:

_n_ω = 1.702(1) _n_ε = 1.699(1) n = 1.7

δ = 0.003

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

Chemistry of FluorvesuvianiteHide

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Mindat Formula:

Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,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.

As it is not explicit if all "O11" sites can be occupied by F in the ideal end-member, the use of (F,OH) is retained here.

Crystallography of FluorvesuvianiteHide

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Crystal System:

Tetragonal

Class (H-M):

4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal

Cell Parameters:

a = 15.51 Å, c = 11.77 Å

Unit Cell V:

2,831.39 ų (Calculated from Unit Cell)

Morphology:

{100}, {110}, elongated along [001]

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005894	Fluorvesuvianite	Britvin S N, Antonov A A, Krivovichev S V, Armbruster T, Burns P C, Chukanov N V (2003) Fluorvesuvianite, Ca19(Al,Mg,Fe)13[SiO4]10[Si2O7]4O(F,OH)9, a new mineral species from Pitkaranta, Karelia, Russia: Description and crystal structure The Canadian Mineralogist 41 1371-1380		2003	Pitkaranta, Karelia, Russia	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of FluorvesuvianiteHide

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General Appearance of Type Material:

fibrous crystals to 1.5 cm

Place of Conservation of Type Material:

Mineralogical Museum, Department of Mineralogy, Saint Petersburg State University, Russia (1/18619).

Geological Setting of Type Material:

calcite filled vugs of a diopside-magnetite skarn

Associated Minerals at Type Locality:

Reference:

Britvin, S.N., Antonov, A.A., Krivovichev, S.V., Armbruster, T., Burns, P.C., and Chukanov, N.V. (2003) Fluorvesuvianite, Ca19(Al,Mg,Fe 2+)13[SiO4]10[Si2O7]4O(F,OH)9, a new mineral species from Pitkäranta, Karelia, Russia: Description and crystal structure. Canadian Mineralogist: 41: 1371-1380.

Other Language Names for FluorvesuvianiteHide

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Simplified Chinese:氟符山石

Traditional Chinese:氟符山石

Relationship of Fluorvesuvianite 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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Fluorescence of FluorvesuvianiteHide

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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 FluorvesuvianiteHide

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References for FluorvesuvianiteHide

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Reference List:

Britvin, S. N., Antonov, A. A., Krivovichev, S. V., Armbruster, T., Burns, P. C., Chukanov, N. V. (2003) Fluorvesuvianute, Ca19(Al,Mg,Fe2+)13[SiO4]10[Si2O7]4O(F,OH)9, a new mineral species from Pitkaranta, Karelia, Russia: Description and crystal structure. The Canadian Mineralogist, 41 (6) 1371-1380 doi:10.2113/gscanmin.41.6.1371

Localities for FluorvesuvianiteHide

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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.