Bradaczekite Mineral Data

Bradaczekite Mineral Data

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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),

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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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Physical Properties of Bradaczekite

Cleavage:

None

Color:

Dark blue.

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Bradaczekite

Electron Density:

r_electron=4.40 gm/cc
note: r_Bradaczekite=4.74 gm/cc.

Fermion Index

Fermion Index = 0.00052
Boson Index = 0.99948

Photoelectric:

PE_Bradaczekite= 38.93 barns/electron
U=PE_Bradaczekite x r_electron= 171.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bradaczekite is Not Radioactive

Bradaczekite Classification

Dana Class:

38.2.4.6 (38)Anhydrous Phosphates, etc

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

(38.2.4)Alluaudite-Wyllieite Group (Wyllieite Subgroup)

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

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

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

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

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

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

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

Strunz Class:

VII/A.07-15 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.07 - Johillerite - Nickenichite series

VII/A.07-10 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m

VII/A.07-15 Bradaczekite NaCu4(AsO4)3 C 2/c 2/m

VII/A.07-20 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m

VII/A.07-30 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Bradaczekite

NaCu4(AsO4)3
Dana No: 38.2.4.6 Strunz No: VII/A.07-15
Locality:

Notes: