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Lüneburgite

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Formula:
Mg3[B2(OH)6](PO4)2 · 6H2O
System:
Triclinic
Colour:
White to brownish or ...
Hardness:
2
Name:
After the type locality, Lüneburg, Germany.
Luneburgite is found in clays with evaporite minerals (Halite, Sylvite, Polyhalite, etc) and has also been found in guano deposits.

Classification of Lüneburgite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Lüneburgite

Year of Discovery:
1870
Geological Setting of First Recorded Material:
Gypsum-bearing marl.
Associated Minerals at First Recorded Locality:

Physical Properties of Lüneburgite

Colour:
White to brownish or green
Hardness (Mohs):
2
Cleavage:
Poor/Indistinct
Prismatic cleavage with an angle of about 73° (viewed microscopically). Minute pseudo-hexagonal plates.
Density:
2.05 g/cm3 (Measured)    

Crystallography of Lüneburgite

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

Optical Data of Lüneburgite

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 Lüneburgite

Formula:
Mg3[B2(OH)6](PO4)2 · 6H2O
Essential elements:
All elements listed in formula:

Relationship of Lüneburgite to other Species

6.AC.05SinhaliteMgAl(BO4)
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3
6.AC.15Behierite(Ta5+,Nb5+)(BO4)
6.AC.15Schiavinatoite(Nb,Ta)(BO4)
6.AC.20FroloviteCa[B(OH)4]2
6.AC.25HexahydroboriteCa[B(OH)4]2 · 6H2O
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4
6.AC.35BandyliteCu[B(OH)4]Cl
6.AC.40TeepleiteNa2[B(OH)4]Cl
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2O
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2
6.AC.65SeamaniteMn32+[B(OH)4](PO4)(OH)2
6.AC.70CahniteCa2[B(OH)4](AsO4)
10.2.2CahniteCa2[B(OH)4](AsO4)
10.2.3TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2O
10.2.4SeamaniteMn32+[B(OH)4](PO4)(OH)2

Other Names for Lüneburgite

Name in Other Languages:
Simplified Chinese:硼磷镁石
Traditional Chinese:硼磷鎂石

Other Information

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 Lüneburgite

Reference List:
Nöllner (1870) Akademie der Wissenschaften, Munich, Sitzber.: 291.

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).

Internet Links for Lüneburgite

Localities for Lüneburgite

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.
Chile
 
  • Antofagasta Region
    • Antofagasta Province
      • Mejillones
No reference listed
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.
  • Thuringia
    • Thuringian Forest
      • Merkers-Kieselbach
F. Heide & E. Bader (1964): Boracit und Lüneburgit im Werra-Kaligebiet.- Chemie der Erde 23, 219-221
Serbia
 
  • Raška District
    • Raška
      • Jarandol Basin
        • Baljevac na Ibru
          • Bella Stena (Bela Stena)
Econ Geol (1992) 87:2169-2174
Turkey
 
  • Central Anatolia Region
    • 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.
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 Province
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
Ukraine
 
  • Crimea Oblast'
    • Crimea peninsula
      • Kerch peninsula (Kertch 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.)
USA
 
  • California
    • Mono Co.
      • Mono Lake
Field collected by Gunnar Farber
  • New Mexico
    • Eddy and Lea Counties
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.
Mineral and/or Locality  
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