Lüneburgite (original) (raw)

A valid IMA mineral species - grandfathered

About LüneburgiteHide

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Formula:

Mg3[B2(OH)6](PO4)2 · 6H2O

Colour:

White to brownish or green, colorless

Name:

After the type locality, Lüneburg, Germany.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2458:3

76a97c81-fef9-499d-9c9b-bacb02598db4

IMA Classification of LüneburgiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Mg3[B2(OH)6(PO4)2] · 6H2O

Type description reference:

Classification of LüneburgiteHide

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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

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

Physical Properties of LüneburgiteHide

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Colour:

White to brownish or green, colorless

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

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RI values:

_n_α = 1.520 - 1.522 _n_β = 1.540 - 1.541 _n_γ = 1.545 - 1.549

2V:

Measured: 63° , Calculated: 62° to 60°

δ = 0.025 - 0.027

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

distinct to strong

Chemistry of LüneburgiteHide

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Mindat Formula:

Mg3[B2(OH)6](PO4)2 · 6H2O

Crystallography of LüneburgiteHide

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Class (H-M):

1 - Pinacoidal

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)

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

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of LüneburgiteHide

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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:

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

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Other Language Names for LüneburgiteHide

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Simplified Chinese:硼磷镁石

Traditional Chinese:硼磷鎂石

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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

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References for LüneburgiteHide

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Reference List:

Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.

Localities for LüneburgiteHide

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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

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- 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.