Tikhonenkovite
A valid IMA mineral species
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About Tikhonenkovite
Igor P. Tikhonenkov
Formula:
Sr[AlF4(OH)(H2O)]
Colour:
Pale pink, colourless
Lustre:
Vitreous
Hardness:
3½
Specific Gravity:
3.26
Crystal System:
Monoclinic
Name:
Named in honor of Igor Petrovich Tikhonenkov (Игорь Петрович Тихоненков) (1927-1961), Russian geologist specializing in alkaline rocks, with the Institute of Mineralogy, Geochemistry and Crystallochemistry of Rare Elements, Moscow.
Dimorph of:
An aluminium complex salt. Chemically identical to acuminite.
Crystal structure is similar to that of acuminite. Difference: type of mutual connection of four Sr polyhedra. In tikhonenkovite it is one edge and two apex sharing connections; in acuminite - two edges and one apex are shared (Krogh Andersen et al., 1991).
Crystal structure is similar to that of acuminite. Difference: type of mutual connection of four Sr polyhedra. In tikhonenkovite it is one edge and two apex sharing connections; in acuminite - two edges and one apex are shared (Krogh Andersen et al., 1991).
Unique Identifiers
Mindat ID:
3961
Long-form identifier:
mindat:1:1:3961:7
GUID
(UUID V4):
(UUID V4):
07e5ca7c-d74a-42e8-9561-f0658241686c
IMA Classification of Tikhonenkovite
Approved
IMA Formula:
SrAlF4(OH) · H2O
First published:
1964
Classification of Tikhonenkovite
3.CC.10
3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
11.6.16.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.4.14
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
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 |
|---|---|---|
| Tik | 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 Tikhonenkovite
Vitreous
Transparency:
Transparent
Colour:
Pale pink, colourless
Streak:
White
Hardness:
3½ on Mohs scale
Cleavage:
Perfect
{001}
{001}
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.26(1) g/cm3 (Measured)
Optical Data of Tikhonenkovite
Type:
Biaxial (-)
RI values:
nα = 1.452 nβ = 1.456 nγ = 1.458
2V:
Measured: 70° , Calculated: 70°
Max Birefringence:
δ = 0.006
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:
r > v distinct
Chemistry of Tikhonenkovite
Mindat Formula:
Sr[AlF4(OH)(H2O)]
Crystallography of Tikhonenkovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.73 Å, b = 10.62 Å, c = 5.02 Å
β = 102.72°
β = 102.72°
Ratio:
a:b:c = 0.822 : 1 : 0.473
Unit Cell V:
453.99 ų (Calculated from Unit Cell)
Morphology:
Prisms {100} and {001}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014058 | Tikhonenkovite | Pudovkina Z V, Chernitsova N M, Pyatenko Yu A (1973) Crystal structure refinement of tikhonenkovite Sr2[Al2F8(OH)2]*2H2O Journal of Structural Chemistry 14 445-448 | 1973 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.89 Å | (100) |
| 3.64 Å | (90) |
| 3.27 Å | (80) |
| 2.095 Å | (70) |
| 2.299 Å | (60) |
| 4.44 Å | (50) |
| 3.33 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Tikhonenkovite
General Appearance of Type Material:
Occurs as small crystals, up to 5 mm in diameter.
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, Russia, number 994/1.
Geological Survey Institute, Moscow, Russia.
Institute of Mineralogy and Geochemistry of Rare Elements, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, number 67133, 67134, vis1209–1212.
Geological Survey Institute, Moscow, Russia.
Institute of Mineralogy and Geochemistry of Rare Elements, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, number 67133, 67134, vis1209–1212.
Geological Setting of Type Material:
Oxidation zone of siderite-rich ore.
Associated Minerals at Type Locality:
Reference:
Khomyakov, A.P., Stepanov, V.I., Moleva, V.A. and Pudovkina, Z.V. (1964) The new mineral tikhonenkovite, SrAlF4(OH)•H2O. Doklady Akademii Nauk USSR: 156: 345-347.
Other Language Names for Tikhonenkovite
Related Minerals - Strunz-mindat Grouping
| 3.CC.05 | Gearksutite | Ca[Al(F,OH)5(H2O)] |
| 3.CC.10 | Acuminite | Sr[AlF4(OH)(H2O)] |
| 3.CC.15 | Artroeite | Pb[AlF3(OH)2] |
| 3.CC.20 | Calcjarlite | Na(Ca,Sr)3Al3(OH)2F14 |
| 3.CC.20 | Jarlite | Na(Sr,Na)7MgAl6F32(OH,H2O)2 |
| 3.CC.20 | Jørgensenite | Na2(Sr,Ba)14Na2Al12F64(OH,F)4 |
Other Information
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 Tikhonenkovite
mindat.org URL:
https://www.mindat.org/min-3961.html
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References for Tikhonenkovite
Reference List:
Localities for Tikhonenkovite
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.
Russia (TL) | |
|
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Karasug REE-Sr-Ba-Fe-fluorite deposit, Chaa-Kholsky District, Tuva, Russia