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Kurnakovite

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Nikolai S. Kurnakov
Formula:
MgB3O3(OH)5 · 5H2O
Colour:
White; colourless in transmitted light
Lustre:
Vitreous
Hardness:
2½ - 3
Specific Gravity:
1.847 - 1.852
Crystal System:
Triclinic
Member of:
Name:
Named in honor of Nikolaĭ Semenovich Kurnakov (Никола́й Семёнович Курнако́в, 6 December 1860, Nolinsk, Russia – 19 March 1941, Barvikha, USSR), mineralogist and chemist. He was one of the founders of the platinum industry in the USSR.
Dimorph of:
Hide all sections | Show all sections

Classification of KurnakoviteHide

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 KurnakoviteHide

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

Optical Data of KurnakoviteHide

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 KurnakoviteHide

Formula:
MgB3O3(OH)5 · 5H2O

Crystallography of KurnakoviteHide

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 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 DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of KurnakoviteHide

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

Other Language Names for KurnakoviteHide

Relationship of Kurnakovite to other SpeciesHide

Member of:
Other Members of this group:
InderboriteCaMg(H3B3O7)2 · 8H2OMon. 2/m
InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
InyoiteCa(H4B3O7)(OH) · 4H2OMon. 2/m
MeyerhofferiteCa2(H3B3O7)2 · 4H2OTric. 1 : P1
SolongoiteCa2(H3B3O7)(OH)ClMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Ulexite37 photos of Kurnakovite associated with Ulexite on mindat.org.
Inderite4 photos of Kurnakovite associated with Inderite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.CA.10AmeghiniteNa(H4B3O7)Mon.
6.CA.15InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
6.CA.25InderboriteCaMg(H3B3O7)2 · 8H2OMon. 2/m
6.CA.30MeyerhofferiteCa2(H3B3O7)2 · 4H2OTric. 1 : P1
6.CA.35InyoiteCa(H4B3O7)(OH) · 4H2OMon. 2/m
6.CA.40SolongoiteCa2(H3B3O7)(OH)ClMon.
6.CA.45Peprossiite-(Ce)(Ce,La)(Al3O)2/3B4O10Hex. 6 m2 : P62m
6.CA.50NifontoviteCa3B6O6(OH)12(H2O)2Mon.
6.CA.55OlshanskyiteCa2[B3O3(OH)6](OH) · 3H2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.2.1HambergiteBe2(BO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.2.2SuaniteMg2[B2O5]Mon.
9.2.3KotoiteMg3[BO3]2Orth. mmm (2/m 2/m 2/m) : Pnnm
9.2.4SzaibélyiteMgBO2(OH)Mon.
9.2.5PreobrazhenskiteMg3B11O15(OH)9Orth.
9.2.6AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
9.2.7WightmaniteMg5(BO3)O(OH)5 · 2H2OMon.
9.2.8PinnoiteMg[B2O(OH)6]Tet. 4/m : P42/m
9.2.10HalurgiteMg2[B4O7]2 · 5H2OMon.
9.2.11InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
9.2.12HungchaoiteMg(B4O7) · 9H2OTric. 1
9.2.13AdmontiteMgB6O10 · 7H2OMon.
9.2.14McallisteriteMg2[B6O7(OH)6]2 · 9H2OTrig. 3m (3 2/m) : R3c
9.2.15RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
9.2.16KaliboriteKMg2H[B6O8(OH)5]2(H2O)4Mon. 2/m : B2/b
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OHex.

Other InformationHide

Notes:
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 KurnakoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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., Belov, N.V. (1970) Crystal structure of kurnakovite Mg2B6O11•15H2O = 2Mg[B3O3(OH)5]•5H2O. Soviet Physics, Doklady: 14: 1139-1142.
Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C. (2003) Handbook of Mineralogy, Volume V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, AZ, 813pp.: 379.

Internet Links for KurnakoviteHide

Localities for KurnakoviteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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