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
GUID
(UUID V4):
(UUID V4):
d8cc8152-f58c-4c7c-b7ce-34a821c166e8
Classification of Komkovite
Approved
First published:
1990
Type description reference:
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 |
---|---|---|
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
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:
Moderate
Chemical Properties of Komkovite
Formula:
BaZr[Si3O9] · 3H2O
IMA Formula:
BaZrSi3O9 · 3H2O
Common Impurities:
Hf,Fe,Ca,K
Crystallography of Komkovite
Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
R3 2
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) |
---|---|---|---|---|---|---|---|
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 | ||
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 |
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:
Reference:
Voloshin, A.V., Pakhomovskiy, Y.Y., Men'shikov, Y.P., Sokolova, Y.V., Yegorov-Tismenko, Y.K. (1990) Komkovite - A new hydrous barium zirconosilicate from the carbonatites of Vuoriyarvi (Kola Peninsula). Mineralogiceskij Zhurnal: 12: 69-73.
Synonyms of Komkovite
Other Language Names for Komkovite
Relationship of Komkovite to other Species
Member of:
Other Members of this group:
Calciohilairite | CaZr[SiO3]3 · 3H2O | Trig. 3 2 : R3 2 |
Hilairite | Na2Zr[SiO3]3 · 3H2O | Trig. 3 2 : R3 2 |
Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O | Trig. 3 2 : R3 2 |
Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O | Trig. 3 2 : R3 2 |
Related Minerals - Strunz-mindat Grouping
9.DM. | Kesebolite-(Ce) | CeCa2Mn(AsO4)(SiO3)3 |
9.DM. | Plumbogaidonnayite | PbZrSi3O9 · 2H2O |
9.DM.05 | Stokesite | CaSn[Si3O9] · 2H2O |
9.DM.10 | Calciohilairite | CaZr[SiO3]3 · 3H2O |
9.DM.10 | Hilairite | Na2Zr[SiO3]3 · 3H2O |
9.DM.10 | Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O |
9.DM.10 | Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
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 | Hydroterskite | Na2ZrSi6O12(OH)6 |
9.DM.40 | Terskite | Na4ZrSi6O16 · 2H2O |
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
ⓘ - 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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
|
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Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia