Cobaltneustadtelite Mineral Data

Cobaltneustadtelite Mineral Data

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General Cobaltneustadtelite Information

Chemical Formula:

Bi2Fe+++(Co,Fe+++)(O,OH)2(OH)2(AsO4)2

Composition:

Molecular Weight = 876.83 gm

Iron 7.64 % Fe 10.93 % Fe₂O₃

Cobalt 4.03 % Co 5.67 % Co₂O₃

Nickel 1.34 % Ni 1.70 % NiO

Bismuth 47.67 % Bi 53.14 % Bi₂O₃

Arsenic 17.09 % As 26.21 % As₂O₅

Hydrogen 0.33 % H 2.98 % H₂O

Oxygen 21.90 % O

______ ______

100.00 % 100.64 % = TOTAL OXIDE

Empirical Formula:

Bi₂Fe³⁺_1.2Co_0.6Ni_0.2O_1.1(OH)_2.9(AsO₄)₂

Environment:

Small vugs in coarse quartz crystals. Small vugs in coarse quartz crystals. Co analogue of neustädtelite and medenbachite; structure

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Mine dumps in the Schneeberg-Neustädtel area, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after the locality and chemical composition.

Synonym:

IMA2000-012

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Cobaltneustadtelite Crystallography

Axial Ratios:

a:b:c =1.4892:1:1.5188

Cell Dimensions:

a = 9.156, b = 6.148, c = 9.338, Z = 2; alpha = 83.24°, beta = 70.56°, gamma = 86.91° V = 491.52 Den(Calc)= 5.92

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.753(1)(202), 2.901(0.96)(203), 2.666(0.72)(202),3.551(0.55)(210), 8.756(0.55)(001), 3.507(0.44)(211), 2.531(0.41)(013),

Forms:

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Forms: [ 1 4 3] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Krause W , Bernhardt H J , McCammon C A , Effenberger H , American Mineralogist , 87 (2002) p.726-738, Neustadtelite and cobaltneustadtelite, the Fe- and Co- analogues of medenbachite

Physical Properties of Cobaltneustadtelite

Cleavage:

[001] Good

Color:

Brown.

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Adamantine

Streak:

light brown

Optical Properties of Cobaltneustadtelite

Gladstone-Dale:

CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1819,KC= 0.19

Optical Data:

Biaxial (-), a=2.02, b=2.09, g=2.12, bire=0.1000

Calculated Properties of Cobaltneustadtelite

Electron Density:

r_electron=5.18 gm/cc
note: r_{Cobaltneustadtelite}=5.92 gm/cc.

Fermion Index

Fermion Index = 0.00187
Boson Index = 0.99813

Photoelectric:

PE_{Cobaltneustadtelite}= 893.33 barns/electron
U=PE_{Cobaltneustadtelite} x r_electron=4,630.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cobaltneustadtelite is Not Radioactive

Cobaltneustadtelite Classification

Dana Class:

41.4.9.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.4)where (A B)5 (XO4)2 Zq

(41.4.9)Medenbachite Group

41.4.9.1 Medenbachite! Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2 P1 1

41.4.9.2 Neustadtelite! Bi2Fe(Fe,Co)(O,OH)2(OH)2(AsO4)2 P1 1

41.4.9.3 Cobaltneustadtelite ! Bi2Fe(Co,Fe)(O,OH)2(OH)2(AsO4)2 P1 1

Strunz Class:

VII/B.37-17 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.37 - Paulkellerite series

VII/B.37-05 Brendelite! (Bi,Pb)2Fe(PO4)(O,OH)3 C 2/m 2/m

VII/B.37-10 Paulkellerite Bi2Fe(PO4)O2(OH)2 C 2/c 2/m

VII/B.37-15 Neustadtelite! Bi2Fe(Fe,Co)(O,OH)2(OH)2(AsO4)2 P1 1

VII/B.37-17 Cobaltneustadtelite Bi2Fe(Co,Fe)(O,OH)2(OH)2(AsO4)2 P1 1

VII/B.37-20 Medenbachite! Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2 P1 1

Other Cobaltneustadtelite Information

References:

NAME( AmMin, Vol 87, p 726) PHYS. PROP.(AmMin, Vol 87, p 726) OPTIC PROP.(AmMin, Vol 87, p 726)

See Also:

Links to other databases for Cobaltneustadtelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Cobaltneustadtelite

Bi2Fe+++(Co,Fe+++)(O,OH)2(OH)2(AsO4)2
Dana No: 41.4.9.3 Strunz No: VII/B.37-17
Locality:

Notes: