Kurgantaite Mineral Data

Kurgantaite Mineral Data

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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

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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 - PedialH-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

Diaphaniety:

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= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2083,KPDmeas= 0.2174,KC= 0.2161

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:

r_electron=2.87 gm/cc
note: r_Kurgantaite=2.99 gm/cc.

Fermion Index

Fermion Index = 0.04462
Boson Index = 0.95538

Photoelectric:

PE_Kurgantaite= 27.12 barns/electron
U=PE_Kurgantaite x r_electron= 77.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kurgantaite is Not Radioactive

Kurgantaite Classification

Dana Class:

26.5.14.2 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.14)Dana Group

26.5.14.1 Hilgardite Ca2B5O9Cl·(H2O) P1 1

26.5.14.2 Kurgantaite ! CaSr[B5O9]Cl·(H2O) P1 1

Strunz Class:

V/X.00-00 V - Nitrates, Carbonates and Borates

V/X - Unclassified Strunz Nitrates, Carbonates and Borates

V/X.00 - Borate, Hydrated Chloride

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Kurgantaite

CaSr[B5O9]Cl·(H2O)
Dana No: 26.5.14.2 Strunz No: V/X.00-00
Locality:

Notes: