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Kurnakovite

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Boron Pit, U.S. Borax Mine, Boron, Kramer District, Kern Co., California, USA
© Caltech

Show Kurnakovite Photos (4)
Formula:
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
System:TriclinicColour:White; colourless in ...
Hardness:2½ - 3
Name:For Russian mineralogist and chemist Nikolai S. Kurnakov (1860-1941).
Dimorph of:Inderite
This page provides mineralogical data about Kurnakovite.

Classification of Kurnakovite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/H.06-10
Nickel-Strunz 10th (pending) edition ID:6.CA.20

6 : BORATES
C : Triborates
A : Neso-triborates
Dana 8th edition ID:26.3.3.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
Hey's CIM Ref.:9.2.9

9 : Borates
2 : Borates of Be and Mg
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Type Occurrence of Kurnakovite

Type Locality:Deposit No. 33, Inder B deposit and salt dome, Atyrau (Gur'yev), Atyrau Oblysy (Atyrau Oblast'), Kazakhstan
Place of Conservation of Type Material:A. E. Fernsman Mineralogical Museum, Moscow Russia 61590
Year of Discovery:1940
Associated Minerals at type locality:
Szaibélyite

Physical Properties of Kurnakovite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:White; colourless in transmitted light
Streak:White
Hardness (Mohs):2½ - 3
Cleavage:Poor/Indistinct
On {010}.
Density (measured):1.847 - 1.852 g/cm3
Density (calculated):1.855 g/cm3

Crystallography of Kurnakovite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 8.3479(1) Å, b = 10.6068(1) Å, c = 6.4447(1) Å
α = 98.846°, β = 108.981°, γ = 105.581°
Ratio:a:b:c = 0.787 : 1 : 0.608
Unit Cell Volume:V 501.24 ų (Calculated from Unit Cell)
Z:2
Morphology:Rough prismatic crystals to 37cm. Dense aggregates.
Twinning:Twinned at times.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Kurnakovite

Type:Biaxial (-)
RI values: nα = 1.488 - 1.491 nβ = 1.508 - 1.510 nγ = 1.515 - 1.525
2V:Measured: 60° to 80°, Calculated: 60°
Maximum Birefringence:δ = 0.027 - 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak r > v

Chemical Properties of Kurnakovite

Formula:
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
Essential elements:B, H, Mg, O
All elements listed in formula:B, H, Mg, O

Relationship of Kurnakovite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.CA.10Ameghinite
Na(H
 
4
B
 
3
O
 
7
)
6.CA.15Inderite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
6.CA.25Inderborite
CaMg(H
 
3
B
 
3
O
 
7
)
 
2
 · 8H
 
2
O
6.CA.30Meyerhofferite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)
 
2
 · 4H
 
2
O
6.CA.35Inyoite
Ca(H
 
4
B
 
3
O
 
7
)(OH) · 4H
 
2
O
6.CA.40Solongoite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)(OH)Cl
6.CA.45Peprossiite-(Ce)
(Ce,La)(Al
 
3
O)
 
2/3
B
 
4
O
 
10
6.CA.50Nifontovite
CaB
 
2
O
 
4
·2.3H
 
2
O
6.CA.55Olshanskyite
Ca
 
3
[OH|{B(OH)
 
4
}
 
2
]
 
2
Related Minerals - Hey's Index Grouping:

- +
9.2.1Hambergite
Be
 
2
[O|OH|BO
 
2
]
9.2.2Suanite
Mg
 
2
[B
 
2
O
 
5
]
9.2.3Kotoite
Mg
 
3
[BO
 
3
]
 
2
9.2.4Szaibélyite
Mg
 
2
[B
 
2
O
 
5
] · H
 
2
O
9.2.5Preobrazhenskite
Mg
 
3
B
 
11
O
 
15
(OH)
 
9
9.2.6Aksaite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 2H
 
2
O
9.2.7Wightmanite
Mg
 
5
[O|(OH)
 
5
|BO
 
3
] · 2H
 
2
O
9.2.8Pinnoite
Mg[B
 
2
O
 
5
] · 3H
 
2
O
9.2.10Halurgite
Mg
 
2
[B
 
4
O
 
7
]
 
2
 · 5H
 
2
O
9.2.11Inderite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.12Hungchaoite
Mg[B
 
4
O
 
7
] · 9H
 
2
O
9.2.13Admontite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 4H
 
2
O
9.2.14Mcallisterite
Mg
 
2
[B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 9H
 
2
O
9.2.15Rivadavite
Na
 
6
Mg[B
 
6
O
 
7
(OH)
 
6
]
 
4
 · 10H
 
2
O
9.2.16Kaliborite
KMg
 
2
H[B
 
6
O
 
8
(OH)
 
5
]
 
2
(H
 
2
O)
 
4
9.2.17Iquiqueite
K
 
3
Na
 
4
Mg(CrO
 
4
)B
 
24
O
 
39
(OH)·12H
 
2
O

Other Names for Kurnakovite

Other Languages:
German:Kurnakovit
Russian:Курнаковит
Spanish:Kurnakovita

Other Information

Other Information:Insoluble in water. Soluble in warm acids.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Kurnakovite

Reference List:Godlevsky (1940) Comptes rendus de l’académie des sciences de l’U.R.S.S: 28: 638.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 360.

Acta Crystallographica: B30: 2194-2199.

Razmanova, .P., Rumanova, I.M., and Belov, N.V. (1970) Crystal structure of kurnakovite Mg2B6O11•15H2O = 2Mg[B3O3(OH)5]•5H2O. Soviet Physics, Doklady: 14: 1139-1142.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2003) Handbook of Mineralogy, Volume V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, AZ, 813pp.: 379.

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    Localities for Kurnakovite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • Salta
      • Salar Del Hombre Muerto
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    Kazakhstan
     
    • Atyrau Oblysy (Atyrau Oblast')
      • Atyrau (Gur'yev)
        • Inder B deposit and salt dome
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    Turkey
     
    • Central Anatolia Region
      • Eskisehir Province
    		CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
      • Yozgat Province
    		http://www.mineralienatlas.de/lexikon/index.php/T%FCrkei/Eskisehir/Kirka/Sarikaya
    USA
     
    • California
      • Inyo Co.
        • Death Valley
          • Furnace Creek District
            • Black Mts
    		www.mineralsocal.org
      • Kern Co.
        • Kramer District
    		Rock Currier collection
            • U.S. Borax Mine
    		No reference listed
    Cal Div of Mines & Geology "Mineral Information Service" V. 22 N. 10 Oct 1969
    Mineral and/or Locality
    Google
     
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