Kurnakovite Mineral Data

Kurnakovite Mineral Data +

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.

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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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

Diaphaniety:

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= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2767,KPDmeas= 0.2752,KC= 0.2732

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:

r_electron=1.91 gm/cc
note: r_Kurnakovite=1.83 gm/cc.

Fermion Index

Fermion Index = 0.03211
Boson Index = 0.96789

Photoelectric:

PE_Kurnakovite= 0.48 barns/electron
U=PE_Kurnakovite x r_electron= 0.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kurnakovite is Not Radioactive

Kurnakovite Classification

Dana Class:

26.3.3.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.3)Dana Type

(26.3.3)Dana Group

26.3.3.1 Kurnakovite MgB3O3(OH)5·5(H2O) P1 1

Strunz Class:

V/H.06-10 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.06 - Kurnakovite - Solongoite series

V/H.06-10 Kurnakovite MgB3O3(OH)5·5(H2O) P1 1

V/H.06-20 Inderite MgB3O3(OH)5·5(H2O) P 2₁/a 2/m

V/H.06-30 Inderborite CaMg[B3O3(OH)5]2·6(H2O) A2/a 2/m

V/H.06-40 Meyerhofferite Ca2B6O6(OH)10·2(H2O) P1 1

V/H.06-50 Inyoite Ca2B6O6(OH)10·8(H2O) P 2₁/a 2/m

V/H.06-60 Solongoite Ca2B3O4(OH)4Cl P 2₁/c 2/m

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Kurnakovite

MgB3O3(OH)5·5(H2O)
Dana No: 26.3.3.1 Strunz No: V/H.06-10
Locality:

Notes: