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Kumtyubeite

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Formula:
Ca5(SiO4)2F2
Colour:
Light pink
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.866 (Calculated)
Crystal System:
Monoclinic
Name:
Named in 2009 by Irina О. Galuskina, Biljana Lazic, Thomas Armbruster, Evgeny V. Galuskin, Viktor M. Gazeev, Aleksander E. Zadov, Nikolai N. Pertsev, Lidia Jeżak, Roman Wrzalik, and Anatoly G. Gurbanov for Kum-Tyube, a mountain plateau where the mineral was found.

The F-dominant analogue of reinhardbraunsite.

Possibly identical with the anthropogenic "kutyukhinite".


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Classification of KumtyubeiteHide

Approved
Approval Year:
2008
9.AF.45

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.3.4

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only

Physical Properties of KumtyubeiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Light pink
Streak:
White
Hardness:
5 - 6 on Mohs scale
Hardness:
VHN50=280 - 320 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
distinct on (001)
Density:
2.866 g/cm3 (Calculated)

Optical Data of KumtyubeiteHide

Type:
Biaxial (-)
RI values:
nα = 1.594(2) nβ = 1.605(2) nγ = 1.608(2)
2V:
Measured: 40° to 55°, Calculated: 54.8°
Birefringence:
0.014
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
X^c = 15°, Z = b.

Chemical Properties of KumtyubeiteHide

Formula:
Ca5(SiO4)2F2

Crystallography of KumtyubeiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 11.4340(19) Å, b = 5.0575(9) Å, c = 8.8657(16) Å
β = 108.860(12)°
Ratio:
a:b:c = 2.261 : 1 : 1.753
Unit Cell V:
485.16 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Granular patches in skarn
Twinning:
polysynthetic, twins on (001)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.3830 (1)
5.4202 (30)
4.5824 (1)
4.3297 (3)
4.1915 (3)
4.00006 (4)
3.8031 (13)
3.3273 (21
3.2269 (4)
3.1374 (3)
3.0344 (37)
2.9399 (17)
2.9018 (16)
2.8932 (13)
2.8635 (3)
2.7943 (2)
2.7737 (25)
2.7101 (12)
2.5713 (20)
2.5452 (12)
2.5282 (2)
2.5112 (17)
2.4917 (10)
2.4621 (2)
2.3640 (2)
2.3168 (2)
2.2530 (2)
2.1369 (3)
2.0511 (2)
2.0126 (4)
1.9926 (3)
1.9360 (2)
1.9128 (2)
1.9040 (100)
1.8952 (37)
1.8748 (2)
1.8209 (4)
1.8145 (2)
1.8063 (14)
1.8027 (23)
1.7267 (6)
1.7216 (6)
1.6915 (4)
1.6766 (9)
1.6655 (1)
1.6587 (28)
1.6492 (3)
1.6183 (2)
1.5748 (2)
1.5551 (6)
1.5403 (8)
1.5274 (2)
1.5221 (1)
1.5026 (2)
1.4925 (4)
Comments:
American Mineralogist, 94, 1361–1370.

Type Occurrence of KumtyubeiteHide

General Appearance of Type Material:
Pale pink grains to 0.25 mm in 1 cm granular aggregates
Place of Conservation of Type Material:
Museum of Natural History, Bern, specimen number NMBE 39572 and in the collection of the Fersman Mineralogical Museum, Moscow, specimen number 3732/1.
Geological Setting of Type Material:
In contact-metasomatic rocks formed by interaction of carbonate xenoliths with subvolcanic magma and volcanites. The mineral occurs in spurrite-rondorfite-ellestadite zones of skarn
Associated Minerals at Type Locality:

Synonyms of KumtyubeiteHide

Other Language Names for KumtyubeiteHide

Relationship of Kumtyubeite to other SpeciesHide

Other Members of this group:
ChegemiteCa7(SiO4)3(OH)2Orth. mmm (2/m 2/m 2/m)
EdgrewiteCa9(SiO4)4F2 Mon. 2/m : P21/b
ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b

Related Minerals - Nickel-Strunz GroupingHide

9.AF.05SillimaniteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m)
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm (2/m 2/m 2/m) : Pbam
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m : B2/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.35TopazAl2(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.40NorbergiteMg3(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth. mmm (2/m 2/m 2/m)
9.AF.55ClinohumiteMg9(SiO4)4F2Mon. 2/m : P21/b
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon.
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2Orth.
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm (2/m 2/m 2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex.
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Dana Grouping (8th Ed.)Hide

52.3.3.1Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
52.3.3.2MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
52.3.3.3Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
52.3.3.4CarboiriteFeAl2(GeO4)O(OH)2Tric.
52.3.3.6HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KumtyubeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Irina О. Galuskina, Biljana Lazic, Thomas Armbruster, Evgeny V. Galuskin, Viktor M. Gazeev, Aleksander E. Zadov, Nikolai N. Pertsev, Lidia Jeżak, Roman Wrzalik, and Anatoly G. Gurbanov (2009): Kumtyubeite Ca5(SiO4)2F2 — A new calcium mineral of the humite group from Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist, 94, 1361–1370.

Internet Links for KumtyubeiteHide

Localities for KumtyubeiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • South Moravia Region
      • Oslavany
Hršelová, P., Cempírek, J., Houzar, S., Sejkora, J. (2013): S,F,Cl-rich mineral assemblages from burned spoil heaps in the Rosice-Oslavany coalfield, Czech Republic. Can. Mineral.: 51(1): 171-188
Russia (TL)
 
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Baksan Valley
        • Upper Chegem volcanic caldera (Verkhnechegemskaya caldera)
          • Lakargi Mt.
Galuskina, I. O., Galuskin, E. V., Kusz, J., Dzierżanowski, P., Prusik, K., Gazeev, V. M., ... & Dubrovinsky, L. (2013). Dzhuluite, Ca3SbSnFe3+ 3O12, a new bitikleite-group garnet from the Upper Chegem Caldera, Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy, 25(2), 231-239
South Ossetia
 
  • Greater Caucasus Mountain Range
    • Kel’ volcanic area
      • Shadil-Khokh volcano
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.
Mineral and/or Locality  
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