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Lüneburgite

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About LüneburgiteHide

Formula:
Mg3[B2(OH)6](PO4)2 · 6H2O
Colour:
White to brownish or green
Hardness:
2
Specific Gravity:
2.05
Crystal System:
Triclinic
Name:
After the type locality, Lüneburg, Germany.
Lüneburgite is found in clays with evaporite minerals (halite, sylvite, polyhalite, etc.) and has also been found in guano deposits.


Classification of LüneburgiteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.AC.60

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
43.5.11.1

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
10.2.1

10 : Borates with other anions
2 : Borates with phosphate or arsenate

Physical Properties of LüneburgiteHide

Colour:
White to brownish or green
Hardness:
Cleavage:
Poor/Indistinct
Prismatic cleavage with an angle of about 73° (viewed microscopically). Minute pseudo-hexagonal plates.
Density:
2.05 g/cm3 (Measured)    

Optical Data of LüneburgiteHide

Type:
Biaxial (-)
RI values:
nα = 1.520 - 1.522 nβ = 1.540 - 1.541 nγ = 1.545 - 1.548
2V:
Measured: 63° , Calculated: 52° to 60°
Max Birefringence:
δ = 0.025 - 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
distinct to strong

Chemical Properties of LüneburgiteHide

Formula:
Mg3[B2(OH)6](PO4)2 · 6H2O
IMA Formula:
Mg3[B2(OH)6(PO4)2] · 6H2O

Crystallography of LüneburgiteHide

Crystal System:
Triclinic
Morphology:
Flattened masses and nodules with fine fibrous to earthy structure. Minute pseudo-hexagonal tablets.

Type Occurrence of LüneburgiteHide

Geological Setting of Type Material:
Gypsum-bearing marl.
Associated Minerals at Type Locality:

Synonyms of LüneburgiteHide

Other Language Names for LüneburgiteHide

Simplified Chinese:硼磷镁石
Traditional Chinese:硼磷鎂石

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.2.2CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4
10.2.3TeruggiteCa4Mg[AsO4]2[B6O7(OH)6]2 · 12H2OMon.
10.2.4SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)

Other InformationHide

IR Spectrum:
Bulganak volcano material [cm-1]: 3495, 3440, 3390s, 3250sh, 3215, 3100, 2965, 2625w, 1665, 1325sh, 1283, 1185, 1122s, 1075s, 973, 891s, 830sh, 783, 712, 664, 638, 576, 537, 520sh, 462w
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 LüneburgiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nöllner, C. (1870) Über den Lüneburgit. Sitzungsberichte der königlich bayerischen Akademie der Wissenschaften zu München, Band I, 291-293.
Domeyko (1880) Comptes rendu de l’Académie des sciences de Paris: 90: 544.
Biltz and Marcus (1912) Zeitschrift für anorganische und allgemeine Chemie, Hamburg, Leipzig: 77: 124.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 103.
Schaller and Henderson (1932) USGS Bulletin 833: 47.
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: 385.
Sen Gupta P K, Swihart G H, Dimitrijevic R (1991): The crystal structure of lüneburgite, Mg3(H2O)6[B2(OH)6(PO4)2]. American Mineralogist 76, 1400-1407.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for LüneburgiteHide

Localities for LüneburgiteHide

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.
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Mejillones
Sen Gupta P K, Swihart G H, Dimitrijevic R (1991): The crystal structure of lüneburgite, Mg3(H2O)6[B2(OH)6(PO4)2]. American Mineralogist 76, 1400-1407.
SEM-EDS by Igor V. Pekov, IR Spectroscopy by Nikita V. Chukanov
China
 
Dongyan Wei (1985): Acta Petrologica Mineralogica et Analytica 4(4), 313-318
Germany
 
  • Lower Saxony
    • Göttingen
      • Reyershausen
Braitsch, O. (1961): Beiträge zur Mineralogie und Petrographie 8, 60-66.
    • Lüneburg
C. Noellner: "Über Lüneburgit", Jb. Naturw. Verein Fstm. Lüneburg (1876), 148-151; 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: 385.
Nöllner, C. (1870) Über den Lüneburgit. Sitzungsberichte der königlich bayerischen Akademie der Wissenschaften zu München. Band I., 291-293.
  • Thuringia
    • Wartburgkreis
      • Krayenberggemeinde
F. Heide & E. Bader (1964): Boracit und Lüneburgit im Werra-Kaligebiet.- Chemie der Erde 23, 219-221
Russia
 
  • Crimea
    • Kerch Peninsula
      • Novoselovka Village area
Shnykov E.F. at al.(1971) Mud Volcanism and Ore Formation (Gryazevoi Vulkanizm i Rudoobrazovanie). Kiev:Naukova Dumka. 332 p. (Rus.)
Serbia
 
  • Central Serbia
    • Raška District
      • Raška
        • Jarandol Basin
          • Baljevac na Ibru
            • Bella Stena (Bela Stena)
Econ Geol (1992) 87:2169-2174
Turkey
 
  • Ankara Province
Helvaci, C., Mordogan, H., Çolak, M., & Gündogan, I. (2004). Presence and distribution of lithium in borate deposits and some recent lake waters of west-central Turkey. International Geology Review, 46(2), 177-190.
  • Central Anatolia Region
    • Ankara Province
Ortı́, F., Gündogan, I., & Helvaci, C. (2002). Sodium sulphate deposits of Neogene age: the Kirmir formation, Beypazari basin, Turkey. Sedimentary Geology, 146(3), 305-333.
Turkmenistan
 
  • Balkan
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
Handbook of Mineralogy
USA
 
  • California
    • Mono Co.
      • Mono Lake
Field collected by Gunnar Färber
  • New Mexico
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: 385.
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: 385.
Handbook of Mineralogy
 
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