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Kurnakovite

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Formula:
MgB3O3(OH)5 · 5H2O
System:
Triclinic
Colour:
White; colourless in ...
Lustre:
Vitreous
Hardness:
2½ - 3
Member of:
Name:
For Russian mineralogist and chemist Nikolai S. Kurnakov (1860-1941).
Dimorph of:

Classification of Kurnakovite

Approved, 'Grandfathered' (first described prior to 1959)
6.CA.20

6 : BORATES
C : Triborates
A : Neso-triborates
26.3.3.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
9.2.9

9 : Borates
2 : Borates of Be and Mg

Physical Properties of Kurnakovite

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

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°
Max Birefringence:
δ = 0.027 - 0.034
Image 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:
MgB3O3(OH)5 · 5H2O
Elements listed in formula:

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:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Kurnakovite

Place of Conservation of Type Material:
A. E. Fernsman Mineralogical Museum, Moscow Russia 61590
Associated Minerals at Type Locality:

Relationship of Kurnakovite to other Species

Member of:
Other Members of Group:
InderboriteCaMg(H3B3O7)2 · 8H2O
InderiteMgB3O3(OH)5 · 5H2O
InyoiteCa(H4B3O7)(OH) · 4H2O
MeyerhofferiteCa2(H3B3O7)2 · 4H2O
SolongoiteCa2(H3B3O7)(OH)Cl
6.CA.10AmeghiniteNaB3O3(OH)4
6.CA.15InderiteMgB3O3(OH)5 · 5H2O
6.CA.25InderboriteCaMg[B3O3(OH)5]2 · 6H2O
6.CA.30MeyerhofferiteCaB3O3(OH)5 · H2O
6.CA.35InyoiteCaB3O3(OH)5 · 4H2O
6.CA.40SolongoiteCa2B3O4(OH)4Cl
6.CA.45Peprossiite-(Ce)(Ce,La)(Al3O)2/3B4O10
6.CA.50NifontoviteCa3[BO(OH)2]6 · 2H2O
6.CA.55OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.2.1HambergiteBe2BO3(OH)
9.2.2SuaniteMg2B2O5
9.2.3KotoiteMg3(BO3)2
9.2.4SzaibélyiteMgBO2(OH)
9.2.5PreobrazhenskiteMg3B11O15(OH)9
9.2.6AksaiteMgB6O7(OH)6 · 2H2O
9.2.7WightmaniteMg5O(BO3)(OH)5 · 2H2O
9.2.8PinnoiteMgB2O(OH)6
9.2.10HalurgiteMg2[B4O5(OH)4]2 · H2O
9.2.11InderiteMgB3O3(OH)5 · 5H2O
9.2.12HungchaoiteMgB4O5(OH)4 · 7H2O
9.2.13AdmontiteMgB6O10 · 7H2O
9.2.14McallisteriteMg2[B6O7(OH)6]2 · 9H2O
9.2.15RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2O
9.2.16KaliboriteHKMg2B12O16(OH)10 · 4H2O
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2O

Other Names for Kurnakovite

Name in Other Languages:

Other Information

Other Information:
Insoluble in water. Soluble in warm acids.
Health Risks:
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.

Internet Links for Kurnakovite

mindat.org URL:
https://www.mindat.org/min-2295.html
Please feel free to link to this page.
Specimens:
The following Kurnakovite specimens are currently listed for sale on minfind.com.

Localities for Kurnakovite

This 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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
    • Los Andes department
      • 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.; CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
China
 
  • Qinghai Province
    • Haixi Autonomous Prefecture
      • Da Qaidam Co. (Dachaidan Co.)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Garrett, D.E. (1998): Borates: Handbook of deposits, processing, properties, and use. Academic Press (San Diego, London), 491 pp.; Zheng, M. P., Qi, W., & Yuan, H. R. (2005). Characteristics of salt lake boron deposits and magnesium borate deposits of the Qinghai-Tibet Plateau, China. In Mineral Deposit Research: Meeting the Global Challenge (pp. 1123-1125). Springer Berlin Heidelberg.
Xiyu Zheng (1994): Journal of Lake Sciences 6(3), 267-275
      • Delhi Co. (Delingha Co.)
Qingzhong Wang, Yingkai Xiao, Chonggeng Zhang, Haizhen Wei, and Zhiqi Zhao (2001): Bulletin of Mineralogy, Petrology and Geochemistry 20(4), 344-366
  • Tibet Autonomous Region
    • Ngari Prefecture
      • Gê'gyai Co. (Geji Co.)
Xiyu Zheng and Shengsong Yu (1981): Scientia Geographica Sinica 1(1), 66-76; Mianping Zheng and Wengao Liu (1982): Geological Review 28(3), 263-266; Zheng Xiyu (1984): Chinese Journal of Oceanology and Limnology 2(2), 218-226; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Xiyu Zheng (1994): Journal of Lake Sciences 6(3), 267-275; Qingzhong Wang, Yingkai Xiao, Chonggeng Zhang, Haizhen Wei, and Zhiqi Zhao (2001): Bulletin of Mineralogy, Petrology and Geochemistry 20(4), 344-366; Xifang Liu and Mianping Zheng (2010): Acta Geologica Sinica 89(11), 1601-1612; Mianping Zheng and Xifang Liu (2010): Acta Geologica Sinica 84(11), 1585-1600
Xiyu Zheng and Shengsong Yu (1981): Scientia Geographica Sinica 1(1), 66-76; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Xiyu Zheng and Shengsong Yu (1981): Scientia Geographica Sinica 1(1), 66-76; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Wenzhi Li, Mianping Zheng, and Yuanyi Zhao (2004): Resources & Industries 6(5), 33-37; Xifang Liu and Mianping Zheng (2010): Acta Geologica Sinica 89(11), 1601-1612
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
      • Gêrzê Co. (Gaize Co.)
Wenzhi Li, Mianping Zheng, and Yuanyi Zhao (2004): Resources & Industries 6(5), 33-37
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; Pekov, I. V. & Abramov, D. V. (1993): Boron deposit of the Inder and its minerals. World of Stones, 1, 23-30.
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
      • Kirka
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.; 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
USA
 
  • California
    • Inyo Co.
      • Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area)
        • 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 (Kramer Borate 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.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 227-228.
Donald E. Garrett (1998) Borates: Handbook of Deposits, Processing, Properties, and Use. Academic Press
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: 228.
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