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.
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
GUID
(UUID V4):
(UUID V4):
ed67a4c0-bf5f-446c-82d9-2ddfb58afbfd
Classification of Odigitriaite
Approved
Approval year:
2015
First published:
2017
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 |
|---|---|---|
| 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
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:
Low
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
Chemical Properties of Odigitriaite
Formula:
CsNa5Ca5[Si14B2O38]F2
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) |
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, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Muftakhov, V.A. (2016) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new cesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine: 81: 113-122.
Synonyms of Odigitriaite
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.
External Links:
Mineral Dealers:
References for Odigitriaite
Reference List:
Localities for Odigitriaite
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) | |
|
