Avdeevite
A discredited species name
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About Avdeevite
Formula:
NaAl4(Be5Li)(Si6O18)2(H2O)1-2
formerly given as: (Na,Cs)(Be2Li)Al2(Si6O18)
Change ref.: Pieczka, A. (2023): Proposal 23-E
Change ref.: Pieczka, A. (2023): Proposal 23-E
Colour:
Pink
Lustre:
Vitreous
Hardness:
8
Specific Gravity:
2.89
Crystal System:
Hexagonal
Name:
To honor "the outstanding Russian chemist and mining engineer Ivan Vasil’evich Avdeev (Иван Васильевич Авдеев) (1818-1865)", for his contributions to studies of natural and synthetic compounds of beryllium.
Discredited in 2025 (IMA Newsletter 87).
Unique combination of elements. First Na-dominant member of the group.
Differences when comparing to beryl:
- sum of large cations within the channels is >0.5 apfu
- Na dominates there
Unique combination of elements. First Na-dominant member of the group.
Differences when comparing to beryl:
- sum of large cations within the channels is >0.5 apfu
- Na dominates there
Unique Identifiers
Mindat ID:
53344
Long-form identifier:
mindat:1:1:53344:3
IMA Classification of Avdeevite
Discredited
Approval year:
2018
First published:
2020
Approval history:
Formula redefinition:
Pieczka, A. (2023): Proposal 23-E
discredited
Pieczka, A. (2023): Proposal 23-E
discredited
Classification of Avdeevite
9.CJ.
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
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 |
|---|---|---|
| Avd | 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 Avdeevite
Vitreous
Transparency:
Transparent
Colour:
Pink
Comment:
Colorless in transmitted light.
Hardness:
8 on Mohs scale
Density:
2.89(2) g/cm3 (Measured) 2.875 g/cm3 (Calculated)
Optical Data of Avdeevite
Type:
Uniaxial (-)
RI values:
nω = 1.601 nε = 1.594
Max. Birefringence:
δ = 0.007
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:
Moderate (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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Non-pleochroic
Comments:
Colourless in transmitted light.
Chemistry of Avdeevite
Mindat Formula:
NaAl4(Be5Li)(Si6O18)2(H2O)1-2
formerly given as: (Na,Cs)(Be2Li)Al2(Si6O18)
Change ref.: Pieczka, A. (2023): Proposal 23-E
formerly given as: (Na,Cs)(Be2Li)Al2(Si6O18)
Change ref.: Pieczka, A. (2023): Proposal 23-E
Element Weights:
Crystallography of Avdeevite
Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 9.2287(4) Å, c = 9.2610(3) Å
Ratio:
a:c = 1 : 1.003
Unit Cell V:
683.08 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.96 Å | (82) |
| 4.60 Å | (31) |
| 3.99 Å | (20) |
| 3.26 Å | (100) |
| 3.02 Å | (37) |
| 2.866 Å | (84) |
| 2.524 Å | (13) |
| 1.742 Å | (19) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
First Recorded Occurrence of Avdeevite
General Appearance of First Recorded Material:
Sheaf-like aggregates, up to 4 cm in diameter (comprising hexagonal crystals, up to 1 x 0.1 cm), with epitactically intergrown cores of avdeevite and rims of beryl.
Place of Conservation of First Recorded 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 5279/1.
Geological Setting of First Recorded Material:
Granite pegmatite.
Associated Minerals at First Recorded Locality:
Synonyms of Avdeevite
Other Language Names for Avdeevite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 9.CJ. | Zolotarevite | Na5Zr[Si6O15(OH)3] · 3H2O |
| 9.CJ. | 'Beryllocordierite-Na' | NaMg4(Al5Be)(AlSi5O18)2 · 2H2O |
| 9.CJ. | Sachanbińskiite | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O |
| 9.CJ. | Nakkaalaaqite | K2[Na3Ca]LiCa2Ti2Be4Si12O38 |
| 9.CJ.05 | Johnkoivulaite-(Cs) | Cs[Be2B]Mg2Si6O18 |
| 9.CJ.05 | Beryl | Be3Al2(Si6O18) |
| 9.CJ.05 | Bazzite | Be3Sc2(Si6O18) |
| 9.CJ.05 | Ferroindialite | (Fe2+,Mg)2Al4Si5O18 |
| 9.CJ.05 va | 'Vorobyevite' | Be3Al2(Si6O18) |
| 9.CJ.05 | Stoppaniite | Be3Fe3+2(Si6O18) · H2O |
| 9.CJ.05 | Indialite | Mg2Al3(AlSi5O18) |
| 9.CJ.10 | Sekaninaite | Fe2+2Al4Si5O18 |
| 9.CJ.10 | Cordierite | Mg2Al4Si5O18 |
| 9.CJ.15a | Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) |
| 9.CJ.15a | Kapustinite | Na6ZrSi6O16(OH)2 |
| 9.CJ.15a | Townendite | Na8ZrSi6O18 |
| 9.CJ.15a | Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 |
| 9.CJ.15a | Kazakovite | Na6Mn2+Ti(Si6O18) |
| 9.CJ.15a | Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O |
| 9.CJ.15a | Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O |
| 9.CJ.15a | Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 |
| 9.CJ.15c | Koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O |
| 9.CJ.15b | Imandrite | Na12Ca3Fe3+2(Si6O18)2 |
| 9.CJ.25 | Baratovite | KCa7(Ti,Zr)2Li3Si12O36F2 |
| 9.CJ.25 | Aleksandrovite | KCa7Sn2Li3Si12O36F2 |
| 9.CJ.25 | Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 |
| 9.CJ.30 | Dioptase | CuSiO3 · H2O |
| 9.CJ.35 | Kostylevite | K2Zr(Si3O9) · H2O |
| 9.CJ.40 | Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
| 9.CJ.45 | Gerenite-(Y) | (Ca,Na)2(Y,REE)3Si6O18 · 2H2O |
| 9.CJ.50 | Odintsovite | K2Na4Ca3Ti2Be4Si12O38 |
| 9.CJ.55 | Mathewrogersite | Pb7FeAl3GeSi12O36(OH,H2O)6 |
| 9.CJ.60 | Pezzottaite-(Cs) | Cs(Be2Li)Al2(Si6O18) |
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 Avdeevite
mindat.org URL:
https://www.mindat.org/min-53344.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Avdeevite
Reference List:
Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839
Agakhanov, A. A., Stepanenko, D. A., Zubkova, N. V., Pautov, L. A., Pekov, I. V., Kasatkin, A. V., Karpenko, V. Yu., Agakhanova, V. A., Škoda, R., Britvin, S. N., Pushcharovsky, D. Yu. (2021) Avdeevite, a Na-Dominant Alkali Beryl: Determination as Valid Mineral Species and New Data. Geology of Ore Deposits, 63 (7) 654-667 doi:10.1134/s1075701521070023
Localities for Avdeevite
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.
Myanmar (FRL) | |
| Miyawaki et al. (2019) +2 other references |
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Palelni mine, Khetchel village, Molo quarter, Momeik Township, Kyaukme District, Shan State, Myanmar