Bradaczekite Mineral Data

General Bradaczekite Information

Chemical Formula:

NaCu4(AsO4)3

Composition:

Molecular Weight = 686.00 gm

Sodium 4.02 % Na 5.42 % Na₂O

Zinc 0.95 % Zn 1.19 % ZnO

Copper 34.27 % Cu 38.59 % Cu₂O

Arsenic 32.76 % As 50.26 % As₂O₅

Oxygen 27.99 % O

______ ______

100.00 % 95.45 % = TOTAL OXIDE

Empirical Formula:

Na_1.2Cu_3.7Zn_0.1(AsO₄)₃

Environment:

Fumarolic sublimate product. Alluaudite-wyllieite group; structure

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

North Breach of the Tolbachik Great fissure eruption, Kamchatka Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Hans Bradaczek (1940-), crystallographer of the Free University of Berlin.

Synonym:

IMA2000-002

Bradaczekite Image

Images:

Bradaczekite

Comments: SEM image of the aggregates of bradaczekite crystals. (CanMin, v39 , p 1116).
Location: North Breach of the Great fissure Tolbachik eruption (GFTE) in 1975-1976, Kamchatka Peninsula, Russia. Scale: Magnification: ~ 600x.
© Canadian Mineralogist

Bradaczekite Crystallography

Axial Ratios:

a:b:c =0.9691:1:0.5843

Cell Dimensions:

a = 12.051, b = 12.434, c = 7.2662, Z = 4; beta = 117.942° V = 961.86 Den(Calc)= 4.74

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.43(1)(112,310), 3.21(0.35)(002), 2.683(0.3)(240),2.791(0.24)(402), 3.6(0.21)(202,131), 6.22(0.21),

Forms:

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Forms: ( 3 0 1) ( 1 1 0) ( 0 0 1) ( 3 2 1) ( 1 3 1) ( 3 1 1) ( 0 1 0) ( 1 1 1) ( 1 0 0) ( 3 4 1)

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Crystal Structure:

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Krivovichev S V , Filatov S K , Burns P C , Zapiski Vserossijskogo Mineralogicheskogo Obshchestva , 2001 (2001) p.1-8, The Jahn-Teller distortion of copper coordination polyhedra in the alluaudite, structural type: Crystal structure of bradaczekite, NaCu4(AsO4)3

Physical Properties of Bradaczekite

Cleavage:

None

Color:

Dark blue.

Diaphaneity:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Luster:

Adamantine

Streak:

pale blue white

Optical Properties of Bradaczekite

Gladstone-Dale:

CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1857,KC= 0.1839
Ncalc = 1.87

Optical Data:

Biaxial (-), a=1.76, b=1.92, g=1.96, bire=0.2000

Calculated Properties of Bradaczekite

Electron Density:

Bulk Density (Electron Density)=4.40 gm/cc
note: Specific Gravity of Bradaczekite =4.74 gm/cc.

Fermion Index:

Fermion Index = 0.0005251504
Boson Index = 0.9994748496

Photoelectric:

PE_Bradaczekite= 38.93 barns/electron
U=PE_Bradaczekite x rElectron Density= 171.34 barns/cc.

Radioactivity:

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

Bradaczekite Classification

Dana Class:

38.02.04.06 (38)Anhydrous Phosphates, etc

(38.02)(A+ B++)5 (XO4)3

(38.02.04)Alluaudite-Wyllieite Group (Wyllieite Subgroup)

38.02.04.01 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.02 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.03 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.04 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

38.02.04.05 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

38.02.04.06 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

38.02.04.07 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 2₁/n 2/m

Strunz Class:

08.AC.10 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.AC -With medium-sized and large cations

08.AC.10 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m

08.AC.10 Arseniopleite (Ca,Na)(Na,Pb)Mn(Mn,Mg,Fe)2(AsO4)3 I2/a 2/m

08.AC.10 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 2₁/a 2/m

08.AC.10 Caryinite (Na,Pb)(Ca,Na)(Ca,Mn)(Mn,Mg)2(AsO4)3 I2/c 2/m

08.AC.10 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 2₁/a 2/m

08.AC.10 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m

08.AC.10 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m

08.AC.10 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m

08.AC.10 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 2₁/a 2/m

08.AC.10 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m

08.AC.10 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m

08.AC.10 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

08.AC.10 Yazganite! NaFe2(Mg,Mn)(AsO4)3•H2O C 2/c 2/m

08.AC.10 IMA2008-054! NaCaMn2(PO4)[PO3(OH)]2 C 2/c 2/m

Other Bradaczekite Information

References:

NAME( AmMin, Vol 87, p 765) PHYS. PROP.(AmMin, Vol 87, p 765) OPTIC PROP.(AmMin, Vol 87, p 765)

See Also:

Links to other databases for Bradaczekite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Bradaczekite

NaCu4(AsO4)3
Dana No: 38.02.04.06 Strunz No: 08.AC.10
Locality:

Notes: