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⇱ Buchwaldite: Mineral information, data and localities.

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Buchwaldite

A valid IMA mineral species
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Formula:
NaCa(PO4)
Colour:
White
Hardness:
3
Specific Gravity:
3.21 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Vagn Fabritius Buchwald (23 June 1929 Fredriksberg, Denmark - ) professor in the Department of Metallurgy, Danmarks Tekniske Højskole, Lyngby, Denmark. He is an expert on meteorites and wrote several books including Handbook of Iron Meteorites (1975). He famously discovered the 20 ton Agpalilik meteorite in Greenland in 1963, and discovered five new minerals (roaldite, carlsbergite, akaganeite, hibbingite, and arupite).
A synthetic arsenate analogue is known.


Unique IdentifiersHide

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Mindat ID:
794
Long-form identifier:
mindat:1:1:794:8

IMA Classification of BuchwalditeHide

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Approved
First published:
1977

Classification of BuchwalditeHide

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8.AD.25

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
38.1.2.2
38.1.2.2

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
1 : ABXO4
19.4.5

19 : Phosphates
4 : Phosphates of Ca

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.

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

Physical Properties of BuchwalditeHide

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Transparency:
Translucent
Colour:
White
Streak:
White
Hardness:
Comment:
Fairly low, less than 3
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Fracture:
Splintery
Density:
3.21 g/cm3 (Calculated)

Optical Data of BuchwalditeHide

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Type:
Biaxial (-)
RI values:
nα = 1.607 nβ = 1.610 nγ = 1.616
2V:
Measured: 65° , Calculated: 72°
Birefringence:
0.009
Max. Birefringence:
δ = 0.009
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Dispersion:
r < v
Optical Extinction:
parallel

Chemistry of BuchwalditeHide

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Mindat Formula:
NaCa(PO4)
Element Weights:
Element% weight
O40.495 %
Ca25.360 %
P19.599 %
Na14.547 %

Calculated from ideal end-member formula.

Crystallography of BuchwalditeHide

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Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Setting:
Pmn21
Cell Parameters:
a = 5.167(25) Å, b = 9.259(45) Å, c = 6.737(32) Å
Ratio:
a:b:c = 0.558 : 1 : 0.728
Unit Cell V:
322.31 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Fibers.
Comment:
Am Min(1977) 62:362.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009985BuchwalditeBen Amara M, Vlasse M, Le Flem G, Hagenmuller P (1983) Structure of the low-temperature variety of calcium sodium orthophosphate, NaCaPO4 Acta Crystallographica C39 1483-1485👁 Image
1983synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
3.79 Å(90)
2.72 Å(100)
2.63 Å(60)
2.58 Å(50)
2.51 Å(40)
2.19 Å(40)
1.91 Å(80)
1.54 Å(30)
Comments:
ICDD 29-1194

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
5 : Primary asteroid phases4.566–4.560

Type Occurrence of BuchwalditeHide

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General Appearance of Type Material:
Minute interlocking fibers.
Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark, number 1967.41.
Geological Setting of Type Material:
Cape York meteorite.
Associated Minerals at Type Locality:

Synonyms of BuchwalditeHide

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Other Language Names for BuchwalditeHide

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German:Buchwaldit
Simplified Chinese:磷钠钙石
Spanish:Buchwaldita

Related Minerals - Strunz-mindat GroupingHide

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8.AD.'Unnamed (Monoclinic polymorph of ximengite)'Bi(PO4)Mon. 2/m : P21/m
8.AD.KepleriteCa9(Ca0.5◻0.5)Mg(PO4)7Trig. 3m : R3c
8.AD.MazoriteBa3(PO4)2Trig. 3m(32/m) : R3m
8.AD.DeynekoiteCa9◻Fe3+(PO4)7Trig. 3m : R3c
8.AD.Monazite-(Gd)Gd(PO4)Mon.
8.AD.05NahpoiteNa2(PO3OH)Mon. 2/m : P21/m
8.AD.10WeiliteCa(HAsO4)Tric. 1 : P1
8.AD.10ŠvenekiteCa(H2AsO4)2Tric. 1 : P1
8.AD.10MonetiteCa(PO3OH)Tric. 1
8.AD.15Archerite(K,NH4)(H2PO4)Tet. 42m : I42d
8.AD.15BiphosphammiteNH4(H2PO4)Tet. 422 : I4122
8.AD.20Phosphammite(NH4)2(PO3OH)Mon. 2/m : P21/b
8.AD.30SchultenitePb(HAsO4)Mon. 2/m : P2/b
8.AD.35DreyeriteBi(VO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Wakefieldite-(La)La(VO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Anningite-(Ce)(Ca0.5Ce4+0.5)(VO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35PretuliteSc(PO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Wakefieldite-(Ce)Ce(VO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Wakefieldite-(Y)Y(VO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Xenotime-(Yb)Yb(PO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35'Chernovite-(Ce)'(Ce,Y)(AsO4)Tet.
8.AD.35Xenotime-(Gd)Gd(PO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Chernovite-(Y)Y(AsO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Xenotime-(Y)Y(PO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.35Wakefieldite-(Nd)Nd(VO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
8.AD.40PucheriteBi(VO4)Orth. mmm(2/m2/m2/m)
8.AD.45XimengiteBi(PO4)Trig. 32 : P3121
8.AD.50'UM2005-35-VO:CaFePSiTh'(Th,Ca)(VO4,SiO4,PO4)
8.AD.50RooseveltiteBi(AsO4)Mon. 2/m
8.AD.50Gasparite-(Ce)Ce(AsO4)Mon. 2/m
8.AD.50Monazite-(Sm)Sm(PO4)Mon. 2/m
8.AD.50Monazite-(Ce)Ce(PO4)Mon. 2/m
8.AD.50Monazite-(La)La(PO4)Mon. 2/m
8.AD.50Monazite-(Nd)Nd(PO4)Mon. 2/m
8.AD.50Gasparite-(La)La(AsO4)Mon. 2/m
8.AD.50CheraliteCaTh(PO4)2Mon. 2/m
8.AD.55TetrarooseveltiteBi(AsO4)Tet. 4/m : I41/a
8.AD.60Chursinite[Hg2]2+Hg2+2[AsO4]2Mon. 2/m : P21/b
8.AD.65ClinobisvaniteBi(VO4)Mon. 2/m
8.AD.70GurimiteBa3(VO4)2Trig. 3m : R3m
8.AD.75PicaiteNaCa[AsO3OH][AsO2(OH)2]Mon. 2/m : P21/b

Other InformationHide

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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 BuchwalditeHide

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mindat.org URL:
https://www.mindat.org/min-794.html
Please feel free to link to this page.

References for BuchwalditeHide

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Localities for BuchwalditeHide

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Showing 6 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Germany
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mayen
        • Seekante
Skrzyńska et al. (2023)
Juroszek et al. (Ti 5 Fe) +1 other reference
Greenland (TL)
  • Avannaata
    • Cap York
Mineralogical Society of America - ... +1 other reference
Kazakhstan
  • West Kazakhstan Region
    • Bayterek District
Sharygin (2019)
Poland
  • Greater Poland Voivodeship
    • Poznań
Karwowski et al. (2008)
Uganda
  • Eastern Region
    • Soroti
Kracher +2 other references
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