Kumtyubeite
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About Kumtyubeite
Formula:
Ca5(SiO4)2F2
Colour:
Light pink
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.866 (Calculated)
Crystal System:
Monoclinic
Member of:
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.
Type Locality:
Isostructural with:
The F-dominant analogue of reinhardbraunsite.
Possibly identical with the anthropogenic "kutyukhinite".
Possibly identical with the anthropogenic "kutyukhinite".
Classification of Kumtyubeite
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
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
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 Kumtyubeite
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)
distinct on (001)
Density:
2.866 g/cm3 (Calculated)
Optical Data of Kumtyubeite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
X^c = 15°, Z = b.
Chemical Properties of Kumtyubeite
Formula:
Ca5(SiO4)2F2
Elements listed:
Crystallography of Kumtyubeite
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)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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 Kumtyubeite
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 Kumtyubeite
Relationship of Kumtyubeite to other Species
Member of:
Other Members of this group:
| Chegemite | Ca7(SiO4)3(OH)2 | Orth. mmm (2/m 2/m 2/m) |
| Edgrewite | Ca9(SiO4)4F2 | Mon. 2/m : P21/b |
| Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 | Mon. 2/m : P21/b |
Related Minerals - Nickel-Strunz Grouping
| 9.AF.05 | Sillimanite | Al2(SiO4)O | Orth. mmm (2/m 2/m 2/m) |
| 9.AF.10 | Andalusite | Al2(SiO4)O | Orth. mmm (2/m 2/m 2/m) : Pnnm |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O | Orth. mmm (2/m 2/m 2/m) : Pnnm |
| 9.AF.15 | Kyanite | Al2(SiO4)O | Tric. 1 : P1 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x | Orth. mmm (2/m 2/m 2/m) : Pbam |
| 9.AF.20 | Krieselite | (Al,Ga)2(GeO4)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
| 9.AF.23 | Boromullite | Al9BSi2O19 | Orth. mm2 : Cmc21 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) | Mon. 2/m : P21/m |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 | Mon. 2/m : B2/m |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) | Mon. 2/m : B2/m |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) | Mon. 2/m : B2/m |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 | Orth. mmm (2/m 2/m 2/m) |
| 9.AF.40 | Norbergite | Mg3(SiO4)(F,OH)2 | Orth. mmm (2/m 2/m 2/m) |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 | Mon. 2/m : P21/b |
| 9.AF.45 | Chondrodite | (Mg,Fe2+)5(SiO4)2(F,OH)2 | Mon. 2/m : P21/b |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 | Mon. 2/m : P21/b |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 | Mon. 2/m : P21/b |
| 9.AF.50 | Humite | (Mg,Fe2+)7(SiO4)3(F,OH)2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
| 9.AF.50 | Manganhumite | (Mn2+,Mg)7(SiO4)3(OH)2 | Orth. |
| 9.AF.50 | Unnamed (Ca-analogue of Humite) | Ca7(SiO4)4F2 | Orth. mmm (2/m 2/m 2/m) |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 | Mon. 2/m : P21/b |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 | Mon. |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 | Mon. 2/m |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 | Mon. 2/m : P21/b |
| 9.AF.65 | Ribbeite | (Mn2+,Mg)5(SiO4)2(OH)2 | Orth. |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,☐)2(SiO4)2(O,OH)6 | Hex. |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 | Hex. |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 | Trig. 3 : P3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 | Hex. |
| 9.AF.85 | Chloritoid | (Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2 | Mon. 2/m : B2/b |
| 9.AF.85 | Magnesiochloritoid | MgAl2(SiO4)O(OH)2 | Mon. 2/m : B2/b |
| 9.AF.85 | Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 | Mon. |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) | Orth. mmm (2/m 2/m 2/m) : Pbca |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) | Orth. mmm (2/m 2/m 2/m) : Pbca |
Related Minerals - Dana Grouping (8th Ed.)
| 52.3.3.1 | Chloritoid | (Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2 | Mon. 2/m : B2/b |
| 52.3.3.2 | Magnesiochloritoid | MgAl2(SiO4)O(OH)2 | Mon. 2/m : B2/b |
| 52.3.3.3 | Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 | Mon. |
| 52.3.3.4 | Carboirite | FeAl2(GeO4)O(OH)2 | Tric. |
| 52.3.3.6 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 | Mon. 2/m : P21/b |
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.
References for Kumtyubeite
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 Kumtyubeite
mindat.org URL:
https://www.mindat.org/min-39209.html
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Localities for Kumtyubeite
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The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| 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) | |
| 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 | |
| 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. |
Ukraine | |
| Шарыгин, В. В. (2015). Минералогия метакарбонатной породы из горелого террикона угольной шахты им. Калинина, г. Донецк. Минералогия техногенеза–2015, Миасс, Имин УрО РАН, 13-40. (Mineralogy of a Metacarbonate Rock from a Burned Dump of the Kalinin Coal Mine, Donetsk) |
Lakargi Mt., Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkarian Republic, Northern Caucasus Region, Russia