Neustadtelite Mineral Data

Neustadtelite Mineral Data

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General Neustadtelite Information

Chemical Formula:

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

Composition:

Molecular Weight = 870.06 gm

Iron 9.63 % Fe 13.77 % Fe₂O₃

Cobalt 2.71 % Co 3.81 % Co₂O₃

Bismuth 48.04 % Bi 53.55 % Bi₂O₃

Arsenic 17.22 % As 26.42 % As₂O₅

Hydrogen 0.34 % H 3.00 % H₂O

Oxygen 22.07 % O

______ ______

100.00 % 100.55 % = TOTAL OXIDE

Empirical Formula:

Bi₂Fe³⁺_1.5Co_0.4O_1.1(OH)_2.9(AsO₄)₂

Environment:

Small vugs in coarse quartz crystals. Fe dominant analog of medenbachite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

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

Name Origin:

Named after the locality.

Synonym:

IMA1998-016

Neustadtelite Image

Images:

Neustadtelite

Comments: Scanning electron microscope micrograph of neust?dtelite. (AmMin 87:728).
Location: Mine dumps of the G?ldener Falk mine near Schneeberg-Neust?dtel, Saxony, Germany. Scale: Scale Bar 15 µm.
© American Mineralogist

Neustadtelite Crystallography

Axial Ratios:

a:b:c =0.7404:1:1.4646

Cell Dimensions:

a = 4.551, b = 6.146, c = 9.002, Z = 1; alpha = 95.41°, beta = 99.28°, gamma = 92.89° V = 247.07 Den(Calc)= 5.85

Crystal System:

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

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

By Intensity(I/I_o): 2.913(1)(102), 3.539(1)(111), 3.767(0.9)(012),3.492(0.87)(111), 8.819(0.67)(001), 2.798(0.48021)(021), 2.574(0.43)(013),

Forms:

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Forms: [ 1 5 3] [ 1 0 1] [ 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 Neustadtelite

Cleavage:

[001] Good

Color:

Brown.

Diaphaniety:

Translucent to transparent

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 Neustadtelite

Gladstone-Dale:

CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1835,KC= 0.1908

Optical Data:

Biaxial (-), a=2.02, b=2.08, g=2.12, bire=0.1000

Calculated Properties of Neustadtelite

Electron Density:

r_electron=5.12 gm/cc
note: r_{Neustadtelite}=5.85 gm/cc.

Fermion Index

Fermion Index = 0.00214
Boson Index = 0.99786

Photoelectric:

PE_{Neustadtelite}= 900.37 barns/electron
U=PE_{Neustadtelite} x r_electron=4,609.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Neustadtelite is Not Radioactive

Neustadtelite Classification

Dana Class:

41.4.9.2 (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.37-15 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 Neustadtelite 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 Neustadtelite :
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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Neustadtelite

Bi2Fe+++(Fe+++,Co)(O,OH)2(OH)2(AsO4)2
Dana No: 41.4.9.2 Strunz No: VII/B.37-15
Locality:

Notes: