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Buchwaldite

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Formula:
NaCa(PO
 
4
)
System:OrthorhombicColour:White
Hardness:3
Name:For Dr. Vagn Fabritius Buchwald [June 23, 1929 Fredriksberg, Denmark - ] of Department of Metallurgy, Danmarks Tekniske Højskole, Lyngby, Denmark.



A synthetic arsenate analogue is known.

Classification of Buchwaldite

IMA status:Approved
Strunz 8th edition ID:7/A.12-55
Nickel-Strunz 10th (pending) edition ID:8.AD.25

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

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
1 : ABXO4
Hey's CIM Ref.:19.4.5

19 : Phosphates
4 : Phosphates of Ca
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Type Occurrence of Buchwaldite

Type Locality:Cape York meteorite, Saviksoah Peninsula, Avanna (North Greenland) Province, Greenland
General Appearance of Type Material:Minute interlocking fibers.
Year of Discovery:1977
Geological Setting of type material:Cape York meteorite
Associated Minerals at type locality:
Troilite

Physical Properties of Buchwaldite

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

Crystallography of Buchwaldite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Pmn21
Space Group 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 Volume:V 322.31 ų (Calculated from Unit Cell)
Z:4
Morphology:Fibers.
Comment:Am Min(1977) 62:362.
X-Ray Powder Diffraction:
d-spacingIntensity
3.79 (90)
2.72 (100)
2.63 (60)
2.58 (50)
2.51 (40)
2.19 (40)
1.91 (80)
1.54 (30)
Comments:ICDD 29-1194

Optical Data of Buchwaldite

Type:Biaxial (-)
RI values: nα = 1.607 nβ = 1.610 nγ = 1.616
2V:Measured: 65° , Calculated: 72°
Birefringence:0.009
Maximum Birefringence:δ = 0.009

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v
Optical Extinction:parallel

Chemical Properties of Buchwaldite

Formula:
NaCa(PO
 
4
)
Essential elements:Ca, Na, O, P
All elements listed in formula:Ca, Na, O, P

Relationship of Buchwaldite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AD.05Nahpoite
Na
 
2
HPO
 
4
8.AD.10Monetite
Ca(HPO
 
4
)
8.AD.10Weilite
Ca(HAsO
 
4
)
8.AD.10Švenekite
Ca(H
 
2
AsO
 
4
)
 
2
8.AD.15Archerite
(K,NH
 
4
)(H
 
2
PO
 
4
)
8.AD.15Biphosphammite
(NH
 
4
,K)(H
 
2
PO
 
4
)
8.AD.20Phosphammite
(NH
 
4
)
 
2
(HPO
 
4
)
8.AD.30Schultenite
Pb(HAsO
 
4
)
8.AD.35Chernovite-(Y)
Y(AsO
 
4
)
8.AD.35Dreyerite
Bi(VO
 
4
)
8.AD.35Wakefieldite-(Ce)
Ce(VO
 
4
)
8.AD.35Wakefieldite-(Y)
Y(VO
 
4
)
8.AD.35Xenotime-(Y)
Y(PO
 
4
)
8.AD.35Pretulite
Sc(PO
 
4
)
8.AD.35Xenotime-(Yb)
(Yb,Y,HREE)(PO
 
4
)
8.AD.35Wakefieldite-(La)
La(VO
 
4
)
8.AD.40Pucherite
Bi(VO
 
4
)
8.AD.45Ximengite
Bi(PO
 
4
)
8.AD.50Gasparite-(Ce)
(Ce,REE)(AsO
 
4
)
8.AD.50Monazite-(Ce)
(Ce,La,Nd,Th)(PO
 
4
)
8.AD.50Monazite-(La)
(La,Ce,Nd)(PO
 
4
)
8.AD.50Monazite-(Nd)
(Nd,La,Ce)(PO
 
4
)
8.AD.50Rooseveltite
Bi(AsO
 
4
)
8.AD.50Cheralite
(Ca,Ce)(Th,Ce)(PO
 
4
)
 
2
8.AD.50Monazite-(Sm)
(Sm,Gd,Ce,Th)(PO
 
4
)
8.AD.50UM2005-35-VO:CaFePSiTh
(Th,Ca)(VO
 
4
,SiO
 
4
,PO
 
4
)
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg
+
2
)
 
0.5
Hg
2+
 
(AsO
 
4
)
8.AD.65Clinobisvanite
Bi(VO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
19.4.1Monetite
Ca(HPO
 
4
)
19.4.2Hydroxylapatite
Ca
 
5
(PO
 
4
)
 
3
(OH)
19.4.3Brushite
Ca(HPO
 
4
) · 2H
 
2
O
19.4.4Isoclasite
Ca
 
2
(PO
 
4
)(OH) · 2H
 
2
O
19.4.6Canaphite
Na
 
2
Ca(P
 
2
O
 
7
) · 4H
 
2
O
19.4.7Mundrabillaite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
 · H
 
2
O
19.4.8Whitlockite
Ca
 
9
Mg(PO
 
4
)
 
6
(HPO
 
4
)
19.4.9Brianite
Na
 
2
CaMg(PO
 
4
)
 
2
19.4.10Petersite-(Y)
(Y,Ce,Nd)Cu
 
6
(PO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
Related Minerals - Dana Grouping):

- +
38.1.2.1Marićite
NaFe
2+
 
(PO
 
4
)

Other Names for Buchwaldite

Synonyms:
IMA1975-041
Other Languages:
German:Buchwaldit
Russian:Бухвальдит
Spanish:Buchwaldita

Other Information

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 Buchwaldite

Reference List:

- +
American Mineralogist: 62: 362-364.

Internet Links for Buchwaldite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Buchwaldite details from Handbook of Mineralogy (PDF)
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    • Localities for Buchwaldite

    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.
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    (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.
    Greenland
     
    • Avanna (North Greenland) Province
      • Saviksoah Peninsula
    		Amer.Min.(1977) 62, 362-364
    Poland
     
    • Wielkopolskie
      • Poznan
    		MULTIMINERAL INCLUSIONS IN THE MORASKO COARSE OCTAHEDRITE www.lpi.usra.edu/meetings/metsoc2008/pdf/5232.pdf
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