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Brunovskyite
A valid IMA mineral species
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Bruno Karlovich Brunovsky.
Formula:
NaZrSi2O6(OH)
Colour:
milk colored
Lustre:
Silky
Hardness:
3½
Specific Gravity:
3.44
Crystal System:
Triclinic
Name:
named after the Soviet crystallographer Bruno Karlovich Brunovsky (1900–1938), an engineer at the V.I. Vernadsky Laboratory of the Lomonosov Institute of the Russian Academy of Sciences. Brunovsky successfully solved the first crystal structure in the USSR, the structure of the Khibiny zirconosilicate catapleite.
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
471974
Long-form identifier:
mindat:1:1:471974:4
IMA Classification of Brunovskyite
Classification of Brunovskyite
9.BC.10
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
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 |
|---|---|---|
| Bvs | 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 Brunovskyite
Silky
Colour:
Milk colored
Streak:
White
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
imperfect {001}
imperfect {001}
Density:
3.44(2) g/cm3 (Measured) 3.46 g/cm3 (Calculated)
Optical Data of Brunovskyite
Type:
Biaxial (-)
RI values:
nα = 1.668(5) nβ = 1.700(5) nγ = 1.716(5)
2V:
Measured: 68.2° , Calculated: 70°
Max. Birefringence:
δ = 0.048
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.
Dispersion:
weak r > v
Orientation:
Z = b, Y^c = 50°, Z^a ≈ 90°.
Pleochroism:
Non-pleochroic
Chemistry of Brunovskyite
Mindat Formula:
NaZrSi2O6(OH)
Element Weights:
Crystallography of Brunovskyite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.5471(7) Å, b = 7.1799(8) Å, c = 7.6083(11) Å
α = 64.93(1)°, β = 81.72(1)°, γ = 89.23(1)°
α = 64.93(1)°, β = 81.72(1)°, γ = 89.23(1)°
Ratio:
a:b:c = 0.773 : 1 : 1.06
Unit Cell V:
271.23 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.50 Å | (94) |
| 6.22 Å | (47) |
| 4.31 Å | (28) |
| 3.94 Å | (73) |
| 3.41 Å | (98) |
| 3.03 Å | (100) |
| 2.976 Å | (77) |
| 2.744 Å | (36) |
Type Occurrence of Brunovskyite
General Appearance of Type Material:
white powder-like aggregate rims around parakeldyshite, which it replaces
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogical Museum, St. Petersburg State University, 7-9 Universitetskaya Emb., St. Petersburg 199034, Russia, catalogue no. 19657
Geological Setting of Type Material:
albitized pegmatites in a foyaite of Takhtarvumchorr Mountain,
Associated Minerals at Type Locality:
Synonyms of Brunovskyite
Other Language Names for Brunovskyite
Dutch:Brunovskyiet
German:Brunovskyit
Related Minerals - Strunz-mindat Grouping
| 9.BC. | Anorthoyttrialite-(Y) | Y4(SiO4)(Si3O10) |
| 9.BC. | Kozłowskiite | Ca4(Fe2+Sn3)[Si2O7]2[Si2O6OH]2 |
| 9.BC.05 | Yttrialite-(Y) | (Y,Th)2Si2O7 |
| 9.BC.05 | Thortveitite | Sc2Si2O7 |
| 9.BC.05 | Keiviite-(Y) | Y2Si2O7 |
| 9.BC.05 | Keiviite-(Yb) | Yb2Si2O7 |
| 9.BC.05 | Gittinsite | CaZrSi2O7 |
| 9.BC.10 | Parakeldyshite | Na2ZrSi2O7 |
| 9.BC.10 | Keldyshite | (Na,H)2ZrSi2O7 |
| 9.BC.10 | Khibinskite | K2ZrSi2O7 |
| 9.BC.15 | Rankinite | Ca3Si2O7 |
| 9.BC.20 | Barysilite | Pb8Mn2+[Si2O7]3 |
| 9.BC.25 | Edgarbaileyite | [Hg2]2+3[Si2O7] |
| 9.BC.30 | Kristiansenite | Ca4(Sc2Sn2)[Si2O7]2[Si2O6OH]2 |
| 9.BC.30 | Nybergite | Ca4Sc3Sn(Si2O7)(Si2O6OH)3 |
| 9.BC.30 | Silesiaite | Ca4(Fe3+2Sn2)[Si2O7]2[Si2O6OH]2 |
| 9.BC.35 | Percleveite-(Ce) | Ce2Si2O7 |
| 9.BC.35 | Percleveite-(La) | La2Si2O7 |
| 9.BC.40 | Scottyite | BaCu2Si2O7 |
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 Brunovskyite
mindat.org URL:
https://www.mindat.org/min-471974.html
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Please feel free to link to this page.
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References for Brunovskyite
Localities for Brunovskyite
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) | |
| Bosi et al. (2025) +1 other reference |
