Zvyaginite
A valid IMA mineral species
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About Zvyaginite
Boris B. Zvyagin
Formula:
NaZnNb2Ti[Si2O7]2(OH,F)3(H2O)4+x (x < 1)
Colour:
Colourless, pearly-white, yellowish-brownish, pale pink or lilac-pink
Lustre:
Greasy
Hardness:
2½ - 3
Specific Gravity:
2.88
Crystal System:
Triclinic
Member of:
Name:
Named in honor of Boris Borisovich Zvyagin (Борис Борисович Звя́гин) (14 April 1921, Nevel, Vitebsk, Russia - 18 September 2002, Moscow, Russia), crystallographer, crystal chemist and physicist at IGEM. He was a specialist in the field of electron diffraction methods.
This page provides mineralogical data about Zvyaginite.
Unique Identifiers
Mindat ID:
45949
Long-form identifier:
mindat:1:1:45949:7
Similar Names
| Svyazhinite | A valid IMA mineral species | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O |
IMA Classification of Zvyaginite
Approved
IMA Formula:
Na◻Nb5+2NaZn2+◻Ti4+(Si2O7)2O2(OH)2(H2O)4
Approval year:
2013
First published:
2014
Classification of Zvyaginite
9.00.
9 : SILICATES (Germanates)
0 :
0 :
9 : SILICATES (Germanates)
0 :
0 :
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 |
|---|---|---|
| Zvy | 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 Zvyaginite
Greasy
Transparency:
Transparent, Translucent
Comment:
Nacreous on crystal faces and greasy on broken surface
Colour:
Colourless, pearly-white, yellowish-brownish, pale pink or lilac-pink
Streak:
White
Hardness:
2½ - 3 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
Perfect {001}. Also two directions of distinct cleavage, which are nearly perpendicular to each other and to {001}.
Perfect {001}. Also two directions of distinct cleavage, which are nearly perpendicular to each other and to {001}.
Density:
2.88(3) g/cm3 (Measured) 2.94 g/cm3 (Calculated)
Optical Data of Zvyaginite
Type:
Biaxial (-)
RI values:
nα = 1.626(5) nβ = 1.714(3) nγ = 1.740(5)
2V:
Measured: 45° (15), Calculated: 55°
Birefringence:
Weak, r < v.
Max. Birefringence:
δ = 0.114
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:
Very High (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.
Optical Extinction:
Y and Z lie in the ab plane.
Pleochroism:
Not Visible
Chemistry of Zvyaginite
Mindat Formula:
NaZnNb2Ti[Si2O7]2(OH,F)3(H2O)4+x (x < 1)
Crystallography of Zvyaginite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 8.975(3) Å, b = 8.979(3) Å, c = 12.135(4) Å
α = 74.328(9)°, β = 80.651(8)°, γ = 73.959(8)°
α = 74.328(9)°, β = 80.651(8)°, γ = 73.959(8)°
Ratio:
a:b:c = 1 : 1 : 1.351
Unit Cell V:
900.8 ų
Z:
2
Morphology:
Rectangular or irregularly shaped lamellae flattened on [001].
Comment:
P-1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.72 Å | (100) |
| 5.83 Å | (40) |
| 5.28 Å | (53) |
| 4.289 Å | (86) |
| 3.896 Å | (36) |
| 2.916 Å | (57) |
| 2.862 Å | (72) |
| 1.782 Å | (24) |
Comments:
Malyi Punkaruaiv Mountain, Lovozersky District, Murmansk Oblast, Russia. Data from the 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 Zvyaginite
General Appearance of Type Material:
Rectangular or irregular shaped lamellae up to 0.1 × 1 × 2 cm in size.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of Russian Academy of Sciences, Moscow.
Geological Setting of Type Material:
Hydrothermally altered peralkaline pegmatite.
Associated Minerals at Type Locality:
Synonyms of Zvyaginite
Other Language Names for Zvyaginite
Dutch:Zvyaginiet
German:Zvyaginit
Relationship of Zvyaginite to other Species
Member of:
Other Members of Lamprophyllite Group:
| Barytolamprophyllite | (Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F) | Mon. |
| Bornemanite | Na6BaTi2Nb(Si2O7)2(PO4)O2(OH)F | Tric. 1 : P1 |
| Delindeite | (Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2O | Mon. 2/m : B2/m |
| Emmerichite | Ba2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2 | Mon. 2/m : B2/m |
| Epistolite | (Na◻)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4 | Tric. 1 : P1 |
| Fluorbarytolamprophyllite | (Ba,Sr)2[(Na,Fe2+)3(Ti,Mg)F2][Ti2(Si2O7)2O2] | Mon. 2/m : B2/m |
| Fluorlamprophyllite | Na3(SrNa)Ti3(Si2O7)2O2F2 | Mon. 2/m : B2/m |
| Innelite | Ba4Ti2Na(NaMn2+)Ti(Si2O7)2[(SO4)(PO4)]O2[O(OH)] | Tric. 1 : P1 |
| Kazanskyite | BaNa3Ti2Nb(Si2O7)2O2(OH)2(H2O)4 | Tric. 1 : P1 |
| Lamprophyllite | (Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2 | Mon. 2/m |
| Lileyite | Ba2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2 | Mon. 2/m : B2/m |
| Nabalamprophyllite | (BaNa)Ti2Na3Ti(Si2O7)2O2(OH)2 | Mon. 2/m : P2/m |
| Nechelyustovite | (Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2O | Mon. 2/m : B2/m |
| Phosphoinnelite | Na3Ba4Ti3(Si2O7)2(PO4,SO4)2O2F | Tric. |
| Polyphite | Na5(Na4Ca2)Ti2(Si2O7)(PO4)3O2F2 | Tric. 1 : P1 |
| Saamite | Ba◻Na3Ti2Nb(Si2O7)2O2(OH)F(H2O)2 | Tric. 1 : P1 |
| Shkatulkalite | Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3 | Tric. 1 : P1 |
| Vuonnemite | Na11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH) | Tric. |
Related Minerals - Strunz-mindat Grouping
| 9.00. | Clino-ferri-holmquistite | ◻Li2(Mg3Fe3+2)(Si8O22)(OH)2 |
| 9.00. | Mendigite | Mn2Mn2MnCa(Si3O9)2 |
| 9.00. | Alflarsenite | NaCa2Be3Si4O13(OH) · 2H2O |
| 9.00. | Bridgmanite Subgroup | ABSiO3 |
| 9.00. | Ferroericssonite | BaFe2+2 Fe3+(Si2O7)O(OH) |
| 9.00. | Burnettite | CaVAlSiO6 |
| 9.00. | Ferrisepiolite | (Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2O |
| 9.00. | Yegorovite | Na4[Si4O8(OH)4] · 7H2O |
| 9.00. | Chrysotile | Mg3(Si2O5)(OH)4 |
| 9.00. | 'Shkatulkalita' | |
| 9.00.15 va | 'Chromoamesite' | Mg2(Al,Cr)(AlSiO5)(OH)4 |
| 9.00.50 | Thornasite | Na12Th4+3(Si8O19)4 · 18H2O |
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 Zvyaginite
mindat.org URL:
https://www.mindat.org/min-45949.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Zvyaginite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 18. Mineralogical Magazine, 77 (8) 3249-3258 doi:10.1180/minmag.2013.077.8.15
Sokolova, E.; Cámara, F. (2017) The seidozerite supergroup of TS-block minerals: nomenclature and classification, with change of the following names: rinkite to rinkite-(Ce), mosandrite to mosandrite-(Ce), hainite to hainite-(Y) and innelite-1T to innelite-1A. Mineralogical Magazine, 81 (6). p.1457-1484. doi:10.1180/minmag.2017.081.010
Localities for Zvyaginite
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.
Russia (TL) | |
| Pekov et al. (2014) |
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Malyi Punkaruaiv Mountain, Lovozersky District, Murmansk Oblast, Russia