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|System:||Triclinic||Colour:||White to brownish or ...|
|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
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||5/H.03-20|
|Strunz 9th edition ID:||6.AC.25|
|Nickel-Strunz 10th (pending) edition ID:||6.AC.60|
6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
|Dana 8th edition ID:||220.127.116.11|
43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
|Hey's CIM Ref.:||10.2.1|
10 : Borates with other anions
2 : Borates with phosphate or arsenate
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Type Occurrence of Lüneburgite
|Type Locality:||Lüneburger Kalkberg, Lüneburg, Lower Saxony, Germany|
|Year of Discovery:||1870|
|Geological Setting of type material:||Gypsum-bearing marl.|
|Associated Minerals at type locality:|
Physical Properties of Lüneburgite
|Colour:||White to brownish or green|
Prismatic cleavage with an angle of about 73° (viewed microscopically). Minute pseudo-hexagonal plates.
|Density (measured):||2.05 g/cm3|
Crystallography of Lüneburgite
|Morphology:||Flattened masses and nodules with fine fibrous to earthy structure. Minute pseudo-hexagonal tablets.|
Optical Data of Lüneburgite
|RI values:||nα = 1.520 - 1.522 nβ = 1.540 - 1.541 nγ = 1.545 - 1.548|
|2V:||Measured: 63° , Calculated: 52° to 60°|
|Maximum Birefringence:||δ = 0.025 - 0.026|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||distinct to strong|
Chemical Properties of Lüneburgite
|Essential elements:||B, H, Mg, O, P|
|All elements listed in formula:||B, H, Mg, O, P|
Relationship of Lüneburgite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Lüneburgite
|Health Warning:||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
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
The 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. ? 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.
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Locality Updated: Mt Wyatt area, Whitsunday Region, Queensland, AustraliaFrom Steve Sorrell, 19th May 2013 05:43:10