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Kurnakovite

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U.S. Borax open pit (Boron pit), U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; U.S. Borax and Chemical Corp.; Kramer Mine; Baker Mine), Kramer Borate deposit, Boron, Kramer District, Kern Co., California, USA

Show Kurnakovite Photos (24)



Formula:
MgB
 
3
O
 
3
(OH)
 
5
 · 5H
 
2
O
System:TriclinicColour:White; colourless in ...
Hardness:2½ - 3
Member of:Inderite Group
Name:For Russian mineralogist and chemist Nikolai S. Kurnakov (1860-1941).
Dimorph of:Inderite


Inderite Group.

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 Province (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:
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:
MgB
 
3
O
 
3
(OH)
 
5
 · 5H
 
2
O
Essential elements:B, H, Mg, O
All elements listed in formula:B, H, Mg, O

Relationship of Kurnakovite to other Species

Member of:Inderite Group
Other Members of Group:

- +
Inderborite
CaMg(H
 
3
B
 
3
O
 
7
)
 
2
 · 8H
 
2
O
Inderite
MgB
 
3
O
 
3
(OH)
 
5
 · 5H
 
2
O
Inyoite
Ca(H
 
4
B
 
3
O
 
7
)(OH) · 4H
 
2
O
Meyerhofferite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)
 
2
 · 4H
 
2
O
Solongoite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)(OH)Cl
Related Minerals - Nickel-Strunz Grouping):

- +
6.CA.10Ameghinite
Na(H
 
4
B
 
3
O
 
7
)
6.CA.15Inderite
MgB
 
3
O
 
3
(OH)
 
5
 · 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
Ca
 
3
B
 
6
O
 
6
(OH)
 
12
(H
 
2
O)
 
2
6.CA.55Olshanskyite
Ca
 
3
[B(OH)
 
4
]
 
4
(OH)
 
2
Related Minerals - Hey's Index Grouping:

- +
9.2.1Hambergite
Be
 
2
(BO
 
3
)(OH)
9.2.2Suanite
Mg
 
2
[B
 
2
O
 
5
]
9.2.3Kotoite
Mg
 
3
[BO
 
3
]
 
2
9.2.4Szaibélyite
MgBO
 
2
(OH)
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
(BO
 
3
)O(OH)
 
5
 · 2H
 
2
O
9.2.8Pinnoite
Mg[B
 
2
O(OH)
 
6
]
9.2.10Halurgite
Mg
 
2
[B
 
4
O
 
7
]
 
2
 · 5H
 
2
O
9.2.11Inderite
MgB
 
3
O
 
3
(OH)
 
5
 · 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
Simplified Chinese:富水硼镁石
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.

Best Localities for Kurnakovite

Best of Species:Kurnakovite

Internet Links for Kurnakovite

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  • Raman and XRD data at RRUFF project
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    • Localities for Kurnakovite

    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.
    Hide Locality List
    (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; Am Min 58:308-313; Alonso, R. N. (1999). On the origin of La Puna borates. Acta geológica hispánica, 34(2), 141-166.
    China
     
    • Qinghai Province
      • Haixi Autonomous Prefecture
        • Da Qaidam Co. (Dachaidan Co.)
    		Garrett, D.E. (1998): Borates: Handbook of deposits, processing, properties, and use. Academic Press (San Diego, London), 491 pp.
    • Tibet Autonomous Region
      • Ngari Prefecture
        • Gê'gyai Co. (Geji)
    		Xifang Liu and Mianping Zheng (2010): Acta Geologica Sinica 89(11), 1601-1612
    Mienping Zheng and Wengao Liu (1982): Geological Review 28(3), 263-266; Zheng Xiyu (1984): Chinese Journal of Oceanology and Limnology 2(2), 218-226
    Kazakhstan
     
    • Atyrau Province (Atyrau Oblysy; Atyrau Oblast')
      • Atyrau (Gur'yev)
    		Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
    Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Turkey
     
    • Central Anatolia Region
      • Eskişehir 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; Baysal, O. (1972) : A mineralogical study and genesis of Sarıkaya (Kırka) borate deposits. Hacettepe University, Ankara.
    USA
     
    • California
      • Inyo Co.
        • Death Valley National Park
          • Furnace Creek District (Furnace Creek Borate District)
            • Black Mts
              • Ryan
    		Erd, R.C., J.F. McAllister, and A.C. Vlisidis (1970) Wardsmithite 5CaO • MgO •12B2O3 •30H2O, a new borate mineral from the Death Valley region, California. American Mineralogist: 55: 349-357; Erd, R.C., J.F. McAllister, and G.D. Eberlein (1979) New data on hungchaoite, the second world occurrence, Death Valley region, California. American Mineralogist: 64: 369-375; www.mineralsocal.org.
      • Kern Co.
        • Kramer District
    		Rock Currier collection
    Frondel, Clifford & V. Morgen (1956), Inderite and gerstleyite from the Kramer borate district, Kern County, California: American Mineralogist: 41: 839-843; Frondel, Clifford, V. Morgan & J.L.T. Waugh (1956), Lesserite, a new borate mineral American Mineralogist: 41: 927-928; Schaller, Waldemar Theodore & Mary Emma Mrose (1960), The naming of the hydrous magnesium borate minerals from Boron, California – a preliminary note: American Mineralogist: 45: 732-734; Rumanova, I.M. and Ashirov, A. (1964) The determination of the crystal structure of inderite. Soviet Physics-Crystallography: 8: 414-428; Bowser, C.J. (1965a), Geochemistry and petrology of the sodium borates in the non-marine evaporative environment: Unpublished Ph.. dissertation, University of California, Los Angeles, 307 pp.: 49-50; Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22(9&10): 150-152; 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; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 240.
              • Baker Mine
    		Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 227-228.
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 227-228.
    No reference listed
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 228.
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