Odigitriaite
A valid IMA mineral species
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About Odigitriaite
Formula:
CsNa5Ca5[Si14B2O38]F2
Colour:
colorless
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.80
Crystal System:
Monoclinic
Name:
The name odigitriaite is from the Greek word Oδηγήτρια (She who shows the way; Russian Cyrilic: Одигитрия - Указующая Путь), i.e. indicating extreme fractionation.
New structure type. Unique combination of elements; second Cs-Na-Ca mineral after senkevichite.
The structure is based on double-layer borosilicate sheet, with Cs and Na intercalation; double layers are connected via Ca and Na atoms.
The structure is based on double-layer borosilicate sheet, with Cs and Na intercalation; double layers are connected via Ca and Na atoms.
Unique Identifiers
Mindat ID:
46695
Long-form identifier:
mindat:1:1:46695:6
IMA Classification of Odigitriaite
Approved
Approval year:
2015
First published:
2017
Type description reference:
Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Muftakhov, Vyacheslav A. (2017) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new caesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 81 (1) 113-122 doi:10.1180/minmag.2016.080.074
Classification of Odigitriaite
9.EJ.20
9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates
9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates
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 for Standard |
|---|---|---|
| Odi | 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 Odigitriaite
Vitreous
Transparency:
Translucent
Colour:
Colorless
Streak:
White
Hardness:
5 on Mohs scale
Hardness:
VHN50=606 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Fracture:
Irregular/Uneven
Comment:
fragile
Density:
2.80(2) g/cm3 (Measured) 2.830 g/cm3 (Calculated)
Optical Data of Odigitriaite
Type:
Biaxial
RI values:
nα = 1.502(2) nβ = 1.564(2) nγ = 1.576(2)
2V:
Measured: 46° (2)
Max. Birefringence:
δ = 0.074
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v, weak
Pleochroism:
Non-pleochroic
Comments:
Not measure the α refractive index because the flakes are only a couple of microns thick, and α was calculated from β, γ and 2V meas
Chemistry of Odigitriaite
Mindat Formula:
CsNa5Ca5[Si14B2O38]F2
Element Weights:
Common Impurities:
Mn,OH,(Y,Fe,Al,Pb)
Crystallography of Odigitriaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 16.652(5) Å, b = 9.598(3) Å, c = 22.120(7) Å
β = 92.87(1)°
β = 92.87(1)°
Ratio:
a:b:c = 1.735 : 1 : 2.305
Unit Cell V:
3,530.91 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.66 Å | (33) |
| 4.10 Å | (36) |
| 3.85 Å | (31) |
| 3.68 Å | (40) |
| 3.62 Å | (45) |
| 3.35 Å | (100) |
| 3.25 Å | (35) |
| 3.04 Å | (60) |
Reference:
Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Muftakhov, Vyacheslav A. (2017) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new caesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 81 (1) 113-122 doi:10.1180/minmag.2016.080.074
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Odigitriaite
General Appearance of Type Material:
irregular elongated grains up to 100 μm in length.
Place of Conservation of Type Material:
Type material is deposited in the collections of the A.E. Fersman Mineralogical Museum, Moscow, Russia, registration number 4706/1.
Geological Setting of Type Material:
Odigitriaite was found in the most unusual of the rocks from the Darai-Pioz moraine deposits: cobbles and boulders of quartz (and many rare accessory minerals), ranging in size from 5 to 80 cm
Associated Minerals at Type Locality:
Reference:
Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Muftakhov, Vyacheslav A. (2017) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new caesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 81 (1) 113-122 doi:10.1180/minmag.2016.080.074
Synonyms of Odigitriaite
Other Language Names for Odigitriaite
Dutch:Odigitriaiet
German:Odigitriait
Related Minerals - Strunz-mindat Grouping
| 9.EJ.05 | Lourenswalsite | (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 |
| 9.EJ.10 | Middendorfite | K3Na2Mn5Si12(O,OH)36 · 2H2O |
| 9.EJ.15 | Lipuite | KNa8Mn3+5 Mg0.5[Si12O30(OH)4](PO4)O2(OH)2 · 4H2O |
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 Odigitriaite
mindat.org URL:
https://www.mindat.org/min-46695.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Odigitriaite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Muftakhov, Vyacheslav A. (2017) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new caesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 81 (1) 113-122 doi:10.1180/minmag.2016.080.074
Localities for Odigitriaite
Showing 1 localities.
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) | |
| Agakhanov et al. (2017) +3 other references |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan