Buchwaldite Mineral Data

General Buchwaldite Information

Chemical Formula:

NaCaPO4

Composition:

Molecular Weight = 158.04 gm

Sodium 14.55 % Na 19.61 % Na₂O

Calcium 25.36 % Ca 35.48 % CaO

Phosphorus 19.60 % P 44.91 % P₂O₅

Oxygen 40.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa(PO₄)

Environment:

As inclusions in troilite nodules in an iron meteorite.

IMA Status:

Approved IMA 1977

Locality:

In the Agpalilik and other fragments of the Cape York iron meteorite. Link to MinDat.org Location Data.

Name Origin:

To honor Dr. Vagn Fabius Buchwald (1929- ), Technical University of Denmark, Lyngby, Denmark, for his contributions to the study of iron meteorites.

Name Pronunciation:

Buchwaldite + Pronunciation

Synonym:

ICSD 35629 ?

PDF 29-1194

Buchwaldite Crystallography

Axial Ratios:

a:b:c =0.558:1:0.7276

Cell Dimensions:

a = 5.167, b = 9.259, c = 6.737, Z = 4; V = 322.31 Den(Calc)= 3.26

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P mn2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.72(1), 3.79(0.9), 1.91(0.8),

Physical Properties of Buchwaldite

Color:

White.

Density:

3.21

Hardness:

2-3 - Gypsum-Calcite

Streak:

white

Optical Properties of Buchwaldite

Gladstone-Dale:

CI meas= 0.019 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1874,KPDmeas= 0.1903,KC= 0.194
Ncalc = 1.62 - 1.63

Optical Data:

Biaxial (-), a=1.607, b=1.61, g=1.616, bire=0.0090, 2V(Calc)=72, 2V(Meas)=65.

Calculated Properties of Buchwaldite

Electron Density:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Buchwaldite =3.21 gm/cc.

Fermion Index:

Fermion Index = 0.0005367288
Boson Index = 0.9994632712

Photoelectric:

PE_Buchwaldite= 4.30 barns/electron
U=PE_Buchwaldite x rElectron Density= 13.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Buchwaldite is Not Radioactive

Buchwaldite Classification

Dana Class:

38.01.02.02 (38)Anhydrous Phosphates, etc

(38.01)A+ B++ XO4

(38.01.02)Dana Group

38.01.02.01 Maricite NaFePO4 Pmnb 2/m 2/m 2/m

38.01.02.02 Buchwaldite NaCaPO4 P mn2₁ mm2

Strunz Class:

08.AD.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.25 Buchwaldite NaCaPO4 P mn2₁ mm2

Other Buchwaldite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Buchwaldite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Buchwaldite Specimen Label here :

Buchwaldite

NaCaPO4
Dana No: 38.01.02.02 Strunz No: 08.AD.25
Locality:

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