Kurgantaite Mineral Data

General Kurgantaite Information

Chemical Formula:

CaSr[B5O9]Cl•(H2O)

Composition:

Molecular Weight = 378.64 gm

Strontium 22.68 % Sr 26.82 % SrO

Calcium 10.69 % Ca 14.96 % CaO

Boron 14.27 % B 45.97 % B₂O₃

Hydrogen 0.53 % H 4.76 % H₂O

Chlorine 9.74 % Cl 9.74 % Cl

- % Cl -2.20 % -O=Cl₂

Oxygen 42.09 % O

______ ______

100.00 % 100.04 % = TOTAL OXIDE

Empirical Formula:

Ca_1.01Sr_0.98B₅O_8.96Cl_1.04•(H₂O)

Environment:

Insoluble residue of "sylvinite" rock in a core from the Nepskoye potash deposit, near Ust'-Kut, Irkutsk district, Russia.

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Western Kargan-tau, Inder uplift (Salt Dome), northern Caspian area, western Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality. Revalidated 2002 from a mineral described in 1952 and discredited in 1984.

Synonym:

IMA2000-B

Strontium Hilgardite

Kurgantaite Image

Images:

Kurgantaite

Comments: Crystal fragment of white kurgantaite on sticky stuff.
Location: Korshunovskoye Deposit, Transbaikal, Irkutsk District, Russia. Scale: Specimen Size 6x3x2 mm.
© Sergey Vasiliev / Systematic Mineralogy

Kurgantaite Crystallography

Axial Ratios:

a:b:c =1.0198:1:0.9882

Cell Dimensions:

a = 6.573, b = 6.445, c = 6.369, Z = 1; alpha = 60.995°, beta = 61.257°, gamma = 77.191° V = 201.75 Den(Calc)= 3.12

Crystal System:

Triclinic - Pedial H-M Symbol (1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.92(1)(200), 2.84(0.9)(020), 3.22(0.9)(112,111,201), 2.79(0.8)(102,112), 5.69(0.8)(100,010), 2.07(0.7)(113,223), 2.14(0.7)(211,312,201

Physical Properties of Kurgantaite

Cleavage:

{???} Distinct, {???} Distinct

Color:

White, Colorless.

Density:

2.99

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kurgantaite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2138,KPDmeas= 0.2174,KC= 0.2161
Ncalc = 1.65 - 1.66

Optical Data:

Biaxial (+), a=1.637, b=1.638, g=1.675, bire=0.0380, 2V(Calc)=20, 2V(Meas)=<10. Dispersion dispersion not observed.

Calculated Properties of Kurgantaite

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Kurgantaite =2.99 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Kurgantaite= 27.12 barns/electron
U=PE_Kurgantaite x rElectron Density= 77.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kurgantaite is Not Radioactive

Kurgantaite Classification

Dana Class:

26.05.14.02 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.14)Hilgardite

26.05.14.01 Hilgardite Ca2B5O9Cl•(H2O) P1 1

26.05.14.02 Kurgantaite! CaSr[B5O9]Cl•(H2O) P1 1

26.05.14.03 IMA2007-047! Pb2[B5O9]Cl•0.5H2O Pnn2 mm2

Strunz Class:

06.ED.05 06 - BORATES

06.E - Pentaborates

06.ED -Tecto-pentaborates

06.ED.05 Hilgardite Ca2B5O9Cl•(H2O) P1 1

06.ED.05 Tyretskite Ca2B5O9(OH)•(H2O) P1 1

06.ED.05 Kurgantaite! CaSr[B5O9]Cl•(H2O) P1 1

06.ED.05 IMA2007-047! Pb2[B5O9]Cl•0.5H2O Pnn2 mm2

Other Kurgantaite Information

References:

NAME( AmMin, 87:1510) PHYS. PROP.(AmMin, 87:1510) OPTIC PROP.(AmMin, 87:1510)

See Also:

Links to other databases for Kurgantaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Kurgantaite Specimen Label here :

Kurgantaite

CaSr[B5O9]Cl•(H2O)
Dana No: 26.05.14.02 Strunz No: 06.ED.05
Locality:

Notes:

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