Kurnakovite Mineral Data

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General Kurnakovite Information

Chemical Formula:

MgB3O3(OH)5•5(H2O)

Composition:

Molecular Weight = 279.85 gm

Magnesium 8.69 % Mg 14.40 % MgO

Boron 11.59 % B 37.32 % B₂O₃

Hydrogen 5.40 % H 48.28 % H₂O

Oxygen 74.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgB₃O₃(OH)₅•5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Inder, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for Nikolai S. Kurnakov (1860-1941), Russian mineralogist.

Name Pronunciation:

Kurnakovite + Pronunciation

Synonym:

ICSD 2153

PDF 29-856

Kurnakovite Image

Images:

Kurnakovite

Comments: Very pale lilac-colored crystal of kurnakovite.
Location: Boron, Kramer District, Kern County, California, USA. Scale: 7.2x4x2.5 cm.
© Richard Dale / Dale Minerals

Images:

Kurnakovite

Comments: Chalky white outer alteration, else gray, translucent, coarsely-crystalline kurnakovite.
Location: The Open Pit, Boron, Kern Co., California, USA. Scale: 5x4x3cm.
© Tom Loomis / Dakota Matrix

Kurnakovite Crystallography

Axial Ratios:

a:b:c =0.7879:1:0.6071

Cell Dimensions:

a = 8.344, b = 10.59, c = 6.43, Z = 2; alpha = 99°, beta = 108.9°, gamma = 105.5° V = 511.61 Den(Calc)= 1.82

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 7.22(1), 4.9(0.85), 4.21(0.8),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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I - Data Info
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Corazza E , Acta Crystallographica, Section B , 30 (1974) p.2194-2199, The crystal structure of kurnakovite: a refinement, Locality: California, USA

Physical Properties of Kurnakovite

Cleavage:

{110} Good, {001} Indistinct

Color:

Colorless, White.

Density:

1.83

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Kurnakovite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2708,KPDmeas= 0.2752,KC= 0.2732
Ncalc = 1.5 - 1.51

Optical Data:

Biaxial (-), a=1.488, b=1.508, g=1.515, bire=0.0270, 2V(Calc)=60, 2V(Meas)=63. Dispersion r > v.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Kurnakovite

Electron Density:

Bulk Density (Electron Density)=1.91 gm/cc
note: Specific Gravity of Kurnakovite =1.83 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Kurnakovite= 0.48 barns/electron
U=PE_Kurnakovite x rElectron Density= 0.92 barns/cc.

Radioactivity:

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

Kurnakovite Classification

Dana Class:

26.03.03.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.03)Dana Type

(26.03.03)Dana Group

26.03.03.01 Kurnakovite MgB3O3(OH)5•5(H2O) P1 1

Strunz Class:

06.CA.20 06 - BORATES

06.C - Triborates

06.CA -Neso-triborates

06.CA.20 Kurnakovite MgB3O3(OH)5•5(H2O) P1 1

Other Kurnakovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Kurnakovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Ask about Kurnakovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Kurnakovite

MgB3O3(OH)5•5(H2O)
Dana No: 26.03.03.01 Strunz No: 06.CA.20
Locality:

Notes: