Falgarite
A valid IMA mineral species
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Formula:
K4(VO)3(SO4)5
Colour:
Turquoise
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.87
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 Identifiers
Mindat ID:
53161
Long-form identifier:
mindat:1:1:53161:2
GUID
(UUID V4):
(UUID V4):
b5fcae1a-0f72-4e1f-8215-e1d2431d2d36
IMA Classification of Falgarite
Approved
Approval year:
2018
First published:
2020
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 Falgarite
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
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Fal | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Falgarite
Vitreous
Transparency:
Transparent
Colour:
Turquoise
Streak:
white
Hardness:
2 - 3 on Mohs scale
Cleavage:
None Observed
Parting:
None
Density:
2.87(2) g/cm3 (Measured) 2.89 g/cm3 (Calculated)
Optical Data of Falgarite
Type:
Biaxial (+/-)
RI values:
nα = 1.588(3) nβ = 1.600(3) nγ = 1.609(2)
2V:
Measured: 68° to 90°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Dispersion is strong, v>r
Pleochroism:
Weak
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 Falgarite
Mindat Formula:
K4(VO)3(SO4)5
Elements listed:
Crystallography of Falgarite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 8.709(1) Å, b = 16.146(2) Å, c = 14.450(2) Å
β = 106.785(4)°
β = 106.785(4)°
Ratio:
a:b:c = 0.539 : 1 : 0.895
Unit Cell V:
1953.77 ų
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.26 Å | (40) |
| 3.52 Å | (40) |
| 3.34 Å | (40) |
| 3.20 Å | (70) |
| 3.17 Å | (80) |
| 3.14 Å | (70) |
| 3.01 Å | (50) |
| 2.881 Å | (100) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Falgarite
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:
Coal fire
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 Falgarite
Related Minerals - Strunz-mindat Grouping
| 7.BC. | Adranosite-(Fe) | (NH4)4NaFe3+2(SO4)4Cl(OH)2 |
| 7.BC. | Adranosite | (NH4)4NaAl2(SO4)4Cl(OH)2 |
| 7.BC. | D'Ansite-(Mn) | Na21Mn2+(SO4)10Cl3 |
| 7.BC. | Agaite | Pb3CuTeO5(OH)2(CO3) |
| 7.BC. | D'Ansite-(Fe) | Na21Fe2+(SO4)10Cl3 |
| 7.BC. | Acmonidesite | (NH4,K,Pb)8NaFe2+4(SO4)5Cl8 |
| 7.BC. | Backite | Pb2AlTeO6Cl |
| 7.BC. | Hagstromite | Pb8Cu2+(Te6+O6)2(CO3)Cl4 |
| 7.BC. | Wildcatite | CaFe3+Te6+O5(OH) |
| 7.BC. | Franksousaite | PbCu(Se6+O4)(OH)2 |
| 7.BC. | Zincochenite | Pb4Zn(OH)6(SO4)2 |
| 7.BC. | Viskontite | Pb5Cu2(SO4)3(SeO3)(OH)6 |
| 7.BC.05 | D'Ansite | Na21Mg(SO4)10Cl3 |
| 7.BC.07 | Apatelite | Fe3(SO4)2(OH)5 · 0.5H2O |
| 7.BC.07 | Unnamed (Ba-Fe Vanadate) | Ba, Fe, V, O, H |
| 7.BC.10 | Alunite | KAl3(SO4)2(OH)6 |
| 7.BC.10 | Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
| 7.BC.10 | Ammoniojarosite | (NH4)Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Argentojarosite | AgFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Beaverite-(Cu) | Pb(Fe3+2Cu)(SO4)2(OH)6 |
| 7.BC.10 | Dorallcharite | TlFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Huangite | Ca0.5Al3(SO4)2(OH)6 |
| 7.BC.10 | Hydroniumjarosite | (H3O)Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Jarosite | KFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Natroalunite-2c | (Na,Ca0.5,K)Al3(SO4)2(OH)6 |
| 7.BC.10 | Natroalunite | NaAl3(SO4)2(OH)6 |
| 7.BC.10 | Natrojarosite | NaFe3(SO4)2(OH)6 |
| 7.BC.10 | Osarizawaite | Pb(Al2Cu2+)(SO4)2(OH)6 |
| 7.BC.10 | Plumbojarosite | Pb0.5Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Schlossmacherite | (H3O)Al3(SO4)2(OH)6 |
| 7.BC.10 | Walthierite | Ba0.5Al3(SO4)2(OH)6 |
| 7.BC.10 | Beaverite-(Zn) | Pb(Fe3+2Zn)(SO4)2(OH)6 |
| 7.BC.15 | Ye'elimite | Ca4Al6(SO4)O12 |
| 7.BC.20 | Atlasovite | K(BiO)Cu6Fe3+(SO4)5O3Cl |
| 7.BC.20 | Nabokoite | KCu7(SO4)5(Te4+O3)OCl |
| 7.BC.20 | Puninite | Na2Cu3O(SO4)3 |
| 7.BC.25 | Chlorothionite | K2Cu(SO4)Cl2 |
| 7.BC.30 | Euchlorine | KNaCu3(SO4)3O |
| 7.BC.30 | Fedotovite | K2Cu3(SO4)3O |
| 7.BC.35 | Kamchatkite | KCu3(SO4)2OCl |
| 7.BC.40 | Piypite | K4Cu4O2(SO4)4 · (Na,Cu)Cl |
| 7.BC.45 | Klyuchevskite | K3Cu3(Fe3+,Al)(SO4)4O2 |
| 7.BC.45 | Alumoklyuchevskite | K3Cu3(Al,Fe3+)(SO4)4O2 |
| 7.BC.45 | Belousovite | KZn(SO4)Cl |
| 7.BC.47 | Müllerite | Pb2Fe3+(Te6+O6)Cl |
| 7.BC.50 | Caledonite | Pb5Cu2(SO4)3(CO3)(OH)6 |
| 7.BC.50 | Elasmochloite | Na3Cu6BiO4(SO4)5 |
| 7.BC.52 | Eleomelanite | (K2Pb)Cu4O2(SO4)4 |
| 7.BC.55 | Wherryite | Pb7Cu2(SO4)4(SiO4)2(OH)2 |
| 7.BC.57 | Krasheninnikovite | KNa2CaMg(SO4)3F |
| 7.BC.60 | Mammothite | Pb6Cu4AlSb5+O2(OH)16Cl4(SO4)2 |
| 7.BC.60 | Wulffite | K3NaCu4O2(SO4)4 |
| 7.BC.60 | Parawulffite | K5Na3Cu8O4(SO4)8 |
| 7.BC.62 | Shuvalovite | K2(Ca2Na)(SO4)3F |
| 7.BC.65 | Linarite | PbCu(SO4)(OH)2 |
| 7.BC.65 | Schmiederite | Pb2Cu2(Se6+O4)(Se4+O3)(OH)4 |
| 7.BC.65 | Munakataite | Pb2Cu2(Se4+O3)(SO4)(OH)4 |
| 7.BC.65 | Therasiaite | (NH4)3KNa2Fe2+Fe3+(SO4)3Cl5 |
| 7.BC.65 | Saccoite | Ca2Mn3+2F(OH)8 · 0.5(SO4) |
| 7.BC.70 | Chenite | Pb4Cu(SO4)2(OH)6 |
| 7.BC.75 | Krivovichevite | Pb3Al(OH)6(SO4)(OH) |
| 7.BC.80 | Anhydrokainite | KMg(SO4)Cl |
Fluorescence of Falgarite
Not fluorescent in SW or LW UV
Other Information
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 Falgarite
mindat.org URL:
https://www.mindat.org/min-53161.html
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References for Falgarite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter 45, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (5) 1225-1232 doi:10.1180/mgm.2018.160p.1231
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 Falgarite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Tajikistan (TL) | |
| Hålenius et al. (2018) +1 other reference |
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