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Lüneburgite

A valid IMA mineral species - grandfathered
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About LüneburgiteHide

06589890016039737448267.jpg
Town hall of Lüneburg, Germany
Formula:
Mg3[B2(OH)6](PO4)2 · 6H2O
Colour:
White to brownish or green, colorless
Lustre:
Vitreous
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.


Unique IdentifiersHide

Mindat ID:
2458
Long-form identifier:
mindat:1:1:2458:3
GUID
(UUID V4):
76a97c81-fef9-499d-9c9b-bacb02598db4

IMA Classification of LüneburgiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mg3[B2(OH)6(PO4)2] · 6H2O
First published:
1870

Classification of LüneburgiteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
LbuIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of LüneburgiteHide

Vitreous
Transparency:
Translucent
Colour:
White to brownish or green, colorless
Hardness:
Cleavage:
Poor/Indistinct
Prismatic cleavage with an angle of about 73° (viewed microscopically). Minute pseudo-hexagonal plates.
On {010}, fair.
Density:
2.05 g/cm3 (Measured)    2.204 g/cm3 (Calculated)

Optical Data of LüneburgiteHide

Type:
Biaxial (-)
RI values:
nα = 1.520 - 1.522 nβ = 1.540 - 1.541 nγ = 1.545 - 1.549
2V:
Measured: 63° , Calculated: 62° to 60°
Max Birefringence:
δ = 0.025 - 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
distinct to strong

Chemistry of LüneburgiteHide

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

Crystallography of LüneburgiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.3475(6) Å, b = 9.8027(11) Å, c = 6.2976(5) Å
α = 84.456(9)°, β = 106.402(8)°, γ = 96.400(9)°
Ratio:
a:b:c = 0.648 : 1 : 0.642
Unit Cell V:
372.69 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Flattened masses and nodules with fine fibrous to earthy structure. Minute pseudo-hexagonal tablets.
Twinning:
Common, by rotation about [110].

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.98 Å(100)
4.85 Å(70)
2.964 Å(60)
2.819 Å(45)
3.23 Å(40)
2.507 Å(35)
3.027 Å(30)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
25 : Evaporites (prebiotic)

Type Occurrence of LüneburgiteHide

Place of Conservation of Type Material:
Wroclaw University, Wroclaw, Poland, 1I-5734; National Museum of Natural History, Washington, D.C., USA, 162602.
Geological Setting of Type Material:
Gypsum-bearing marl.
Associated Minerals at Type Locality:
Reference:
Nöllner, C. (1870) Über den Lüneburgit. Sitzungsberichte der königlich bayerischen Akademie der Wissenschaften zu München, Band I: 291-293.

Synonyms of LüneburgiteHide

Other Language Names for LüneburgiteHide

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

Related Minerals - Strunz-mindat GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m)
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon. 2/m : P21/b
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. 1 : P1
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric. 1 : P1
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. 2/m
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mmm (2/m 2/m 2/m) : Pnma
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

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.

Internet Links for LüneburgiteHide

References for LüneburgiteHide

Reference List:

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Mejillones
Gupta et al. (1991)
SEM-EDS by Igor V. Pekov
China
 
Dongyan Wei (1985)
Germany
 
  • Lower Saxony
    • Göttingen District
      • Bovenden
        • Reyershausen
Braitsch (1961)
    • Lüneburg District
      • Lüneburg
C. Noellner: "Über Lüneburgit" (1876) +1 other reference
Nöllner (1870)
  • Thuringia
    • Wartburg District
      • Krayenberggemeinde
F. Heide & E. Bader (1964)
Serbia
 
  • Central Serbia
    • Raška District
      • Raška
        • Jarandol Basin
          • Baljevac na Ibru
            • Bela Stena
Econ Geol (1992)
Turkey
 
  • Ankara Province
Helvaci et al. (2004)
  • Central Anatolia Region
    • Ankara Province
Ortı́ et al. (2002)
Turkmenistan
 
  • Balkan Province
Evseev (1995)
Mineralogical Society of America - ...
Ukraine
 
  • Crimea
    • Kerch Peninsula
      • Novoselovka Village area
Shnykov E.F. at al. (1971)
USA
 
  • California
    • Mono County
      • Mono Lake
Field collected by Gunnar Färber
  • New Mexico
Palache et al. (1951)
Palache et al. (1951)
Mineralogical Society of America - ...
 
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