Komkovite
A valid IMA mineral species
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About Komkovite
Formula:
BaZr[Si3O9] · 3H2O
Colour:
Brown
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.31
Crystal System:
Trigonal
Member of:
Name:
Named in honor of Aleksandr Ivanovich Komkov (Александр Иванович Комков) (1926-1987), mineralogist and crystallographer at the Karpinskii All-Union Research Institute of Geology, St. Petersburg, Russia.
Possibly formed (type material) by alteration of catapleiite.
Unique Identifiers
Mindat ID:
2247
Long-form identifier:
mindat:1:1:2247:3
IMA Classification of Komkovite
Approved
IMA Formula:
BaZr4+Si3O9·3H2O
Approval year:
1988
First published:
1990
Classification of Komkovite
9.DM.10
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
59.2.4.1
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
14.10.31
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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 |
|---|---|---|
| Kkv | 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 Komkovite
Vitreous
Transparency:
Translucent
Colour:
Brown
Streak:
Light brown
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.31 g/cm3 (Measured) 3.31 g/cm3 (Calculated)
Optical Data of Komkovite
Type:
Uniaxial (-)
RI values:
nω = 1.671 nε = 1.644
Max. Birefringence:
δ = 0.027
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
Chemistry of Komkovite
Mindat Formula:
BaZr[Si3O9] · 3H2O
Element Weights:
Common Impurities:
Hf,Fe,Ca,K
Crystallography of Komkovite
Crystal System:
Trigonal
Class (H-M):
32 - Trapezohedral
Space Group:
R32
Cell Parameters:
a = 10.52 Å, c = 15.73 Å
Ratio:
a:c = 1 : 1.495
Unit Cell V:
1,507.62 ų (Calculated from Unit Cell)
Z:
6
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0015621 | Komkovite | Sokolova E V, Arakcheeva A V, Voloshin A V (1991) Crystal structure of komkovite Soviet Physics Doklady 36 666-668 | 1991 | 0 | 293 | ||
| 0012485 | Komkovite | Sokolova E V, Araktscheeva A V, Voloshin A V (1991) Crystal structure of komkovite Doklady Akademii Nauk SSSR 320 1384-1388 | 1991 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.23 Å | (100) |
| 2.96 Å | (90) |
| 3.59 Å | (80) |
| 3.02 Å | (80) |
| 2.57 Å | (60) |
| 2.106 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Komkovite
General Appearance of Type Material:
Equant crystals, 1-5 mm across, with trigonal pyramidal faces.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity.
Mining Institute, St. Petersburg, 2037/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p462/1.
Mining Institute, St. Petersburg, 2037/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p462/1.
Geological Setting of Type Material:
In dolomitic veinlets that cut metasomatically altered pyroxenites in a carbonatite complex.
Associated Minerals at Type Locality:
Synonyms of Komkovite
Other Language Names for Komkovite
Relationship of Komkovite to other Species
Member of:
Other Members of Hilairite Group:
| Calciohilairite | CaZr[SiO3]3 · 3H2O | Trig. 32 : R32 |
| Hilairite | Na2Zr[SiO3]3 · 3H2O | Trig. 32 : R32 |
| Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O | Trig. 32 : R32 |
| Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O | Trig. 32 : R32 |
Related Minerals - Strunz-mindat Grouping
| 9.DM. | Kesebolite-(Ce) | CeCa2Mn(AsO4)(SiO3)3 |
| 9.DM.05 | Stokesite | CaSn[Si3O9] · 2H2O |
| 9.DM.10 | Calciohilairite | CaZr[SiO3]3 · 3H2O |
| 9.DM.10 | Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
| 9.DM.10 | Hilairite | Na2Zr[SiO3]3 · 3H2O |
| 9.DM.10 | Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O |
| 9.DM.15 | Plumbogaidonnayite | PbZrSi3O9 · 2H2O |
| 9.DM.15 | Gaidonnayite | Na2Zr(Si3O9) · 2H2O |
| 9.DM.15 | Georgechaoite | NaKZr[Si3O9] · 2H2O |
| 9.DM.20 | Chkalovite | Na2BeSi2O6 |
| 9.DM.25 | Vlasovite | Na2ZrSi4O11 |
| 9.DM.30 | Revdite | Na16Si16O27(OH)26 · 28H2O |
| 9.DM.35 | Scheuchzerite | Na(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3 |
| 9.DM.40 | Terskite | Na4ZrSi6O16 · 2H2O |
| 9.DM.40 | Hydroterskite | Na2ZrSi6O12(OH)6 |
Fluorescence of Komkovite
Not fluorescent.
Other Information
IR Spectrum:
Absorption features at 3540, 3510, 1665, 1650, 1045, 970, 920, 740, 545, and 495 cm-1. The first four correspond to molecular H2O.
Thermal Behaviour:
One endothermic peak at 140 °C corresponding to the maximum loss of H2O, which is lost completely at 600 °C.
Notes:
Light blue cathodoluminescence.
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 Komkovite
mindat.org URL:
https://www.mindat.org/min-2247.html
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References for Komkovite
Reference List:
Localities for Komkovite
Showing 2 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) | |
| Voloshin et al. (1990) +2 other references |
USA | |
| Robin D. Tibbit (deceased) |
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Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia