Falgarite (original) (raw)

A valid IMA mineral species

Crystal System:

Monoclinic

Name:

For the Falgar, an ancient Sogdian name of an area in Zeravshan riverhead.

Known synthetic analogue. Unique combination of elements (among the known minerals): the first natural potassium vanadyl sulfate.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:53161:2

b5fcae1a-0f72-4e1f-8215-e1d2431d2d36

IMA Classification of FalgariteHide

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Type description reference:

Pautov, Leonid A., Mirakov, Mirak A., Siidra, Oleg I., Faiziev, Abdulkhak R., Nazarchuk, Еvgeny V., Karpenko, Vladimir Yu., Makhmadsharif, Saimudasir (2020) Falgarite, K4(VO)3(SO4)5, a new mineral from sublimates of a natural underground coal fire at the tract of Kukhi-Malik, Fan-Yagnob coal deposit, Tajikistan. Mineralogical Magazine, 84 (3) 455-462 doi:10.1180/mgm.2020.22

Classification of FalgariteHide

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7.BC.55

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations

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 FalgariteHide

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Density:

2.87(2) g/cm3 (Measured) 2.89 g/cm3 (Calculated)

Optical Data of FalgariteHide

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RI values:

_n_α = 1.588(3) _n_β = 1.600(3) _n_γ = 1.609(2)

δ = 0.021

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

Dispersion:

Dispersion is strong, v>r

Comments:

Bluish-green (Z) to light-green (X and Y ). Absorption is Z > Y ≥ X.

Comments:

β calculated. Color is varying from bluish-green (Z) to light-green (X and Y). The optical sign changes From positive in yellow and red light on negative in blue.

Chemistry of FalgariteHide

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Mindat Formula:

K4(VO)3(SO4)5

Crystallography of FalgariteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.709(1) Å, b = 16.146(2) Å, c = 14.450(2) Å
β = 106.785(4)°

Ratio:

a:b:c = 0.539 : 1 : 0.895

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of FalgariteHide

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General Appearance of Type Material:

small isometric or pseudo octahedral individual crystals (10-60 microns) of turquoise color and spherical aggregates up to 0.5 mm in diameter and overgrown on the white sulfate crusts

Place of Conservation of Type Material:

Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5234/1

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Pautov, L.A., Mirakov, M.A., Siidra, O.I., Faiziev, A.R., Nazarchuk, Е.V., Karpenko, V.Y., Makhmadsharif, S. (2020) Falgarite, K4(VO)3(SO4)5, a new mineral from sublimates of a natural underground coal fire at the tract of Kukhi-Malik, Fan-Yagnob coal deposit, Tajikistan. Mineralogical Magazine: 84: 455-462.

Synonyms of FalgariteHide

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Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of FalgariteHide

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Not fluorescent in SW or LW UV

Other InformationHide

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Notes:

The mineral is non-soluble in H2O and 5% HNO3 at room temperature.

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 FalgariteHide

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References for FalgariteHide

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Reference List:

Pautov, Leonid A., Mirakov, Mirak A., Siidra, Oleg I., Faiziev, Abdulkhak R., Nazarchuk, Еvgeny V., Karpenko, Vladimir Yu., Makhmadsharif, Saimudasir (2020) Falgarite, K4(VO)3(SO4)5, a new mineral from sublimates of a natural underground coal fire at the tract of Kukhi-Malik, Fan-Yagnob coal deposit, Tajikistan. Mineralogical Magazine, 84 (3) 455-462 doi:10.1180/mgm.2020.22

Localities for FalgariteHide

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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.