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⇱ Odigitriaite: Mineral information, data and localities.

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Odigitriaite

A valid IMA mineral species
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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.


Unique IdentifiersHide

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Mindat ID:
46695
Long-form identifier:
mindat:1:1:46695:6

IMA Classification of OdigitriaiteHide

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Approved
Approval year:
2015
First published:
2017

Classification of OdigitriaiteHide

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9.EJ.20

9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates

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.

SymbolSourceReference for Standard
OdiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of OdigitriaiteHide

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Vitreous
Transparency:
Translucent
Colour:
Colorless
Streak:
White
Hardness:
Hardness:
VHN50=606 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Comment:
fragile
Density:
2.80(2) g/cm3 (Measured)    2.830 g/cm3 (Calculated)

Optical Data of OdigitriaiteHide

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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.

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.

Surface Relief:
Moderate
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 OdigitriaiteHide

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Mindat Formula:
CsNa5Ca5[Si14B2O38]F2
Element Weights:
Element% weight
O40.289 %
Si26.056 %
Ca13.279 %
Cs8.807 %
Na7.617 %
F2.518 %
B1.433 %

Calculated from ideal end-member formula.
Common Impurities:
Mn,OH,(Y,Fe,Al,Pb)

Crystallography of OdigitriaiteHide

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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)°
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 DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
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)
Comments:
From Type Description.

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of OdigitriaiteHide

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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:

Synonyms of OdigitriaiteHide

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Other Language Names for OdigitriaiteHide

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Related Minerals - Strunz-mindat GroupingHide

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9.EJ.05Lourenswalsite(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12Hex.
9.EJ.10MiddendorfiteK3Na2Mn5Si12(O,OH)36 · 2H2OMon.
9.EJ.15LipuiteKNa8Mn3+5 Mg0.5[Si12O30(OH)4](PO4)O2(OH)2 · 4H2OOrth. mmm(2/m2/m2/m) : Pnnm

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 OdigitriaiteHide

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mindat.org URL:
https://www.mindat.org/min-46695.html
Please feel free to link to this page.

References for OdigitriaiteHide

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Localities for OdigitriaiteHide

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Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Tajikistan (TL)
  • Districts of Republican Subordination
Agakhanov et al. (2017) +3 other references
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