Mineralogy Database

Kurgantaite Mineral Data

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General Kurgantaite Information

Help on Chemical  Formula: Chemical Formula: CaSr[B5O9]Cl•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca1.01Sr0.98B5O8.96Cl1.04•(H2O)
Help on Environment: Environment: Insoluble residue of "sylvinite" rock in a core from the Nepskoye potash deposit, near Ust'-Kut, Irkutsk district, Russia.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Western Kargan-tau, Inder uplift (Salt Dome), northern Caspian area, western Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality. Revalidated 2002 from a mineral described in 1952 and discredited in 1984.
Help on Synonym: Synonym: IMA2000-B
  Strontium Hilgardite

Kurgantaite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0198:1:0.9882
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: {???} Distinct, {???} Distinct
Help on Color: Color: White, Colorless.
Help on Density: Density: 2.99
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Kurgantaite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Kurgantaite =2.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEKurgantaite = 27.12 barns/electron
U=PEKurgantaite x rElectron Density= 77.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kurgantaite is Not Radioactive

Kurgantaite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)Dana Type
  (26.05.14)Hilgardite Hilgardite Ca2B5O9Cl•(H2O) P1 1 Kurgantaite! CaSr[B5O9]Cl•(H2O) P1 1 IMA2007-047! Pb2[B5O9]Cl•0.5H2O Pnn2 mm2
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, 87:1510) PHYS. PROP.(AmMin, 87:1510) OPTIC PROP.(AmMin, 87:1510)
Help on See Also: 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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Dana No: Strunz No: 06.ED.05





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