Neustadtelite Mineral Data
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 % Fe2 O3
Cobalt 2.71 % Co 3.81 % Co2 O3
Bismuth 48.04 % Bi 53.55 % Bi2 O3
Arsenic 17.22 % As 26.42 % As2 O5
Hydrogen 0.34 % H 3.00 % H2 O
Oxygen 22.07 % O
______ ______
100.00 % 100.55 % = TOTAL OXIDE
Empirical Formula:
Bi2 Fe3+ 1.5 Co0.4 O1.1 (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-Neust�dtel 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 neustadtelite. (AmMin 87:728).
Location: Mine dumps of the Güldener Falk mine near Schneeberg-Neustädtel, Saxony, Germany.
Scale: Scale Bar 15 µm.
© American Mineralogist
Images:
Neustadtelite
Comments: Small brown crystals of neustadtelite in matrix.
Location: Sauschwart mine, Schneeberg, Erzgebirge, Saxony, Germany.
Scale: Picture Size 1.5 mm.
© Thomas Witzke
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 - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 2.913(1)(102), 3.539(1)(11 1 ), 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),
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Physical Properties of Neustadtelite
Cleavage:
{001} Good
Color:
Brown.
Diaphaneity:
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 Ncalc = 2.12
Optical Data:
Biaxial (-), a=2.02, b=2.08, g=2.12, bire=0.1000
Calculated Properties of Neustadtelite
Electron Density:
Bulk Density (Electron Density)=5.12 gm/cc note: Specific Gravity of Neustadtelite =5.85 gm/cc.
Fermion Index:
Fermion Index = 0.0021480585 Boson Index = 0.9978519415
Photoelectric:
PENeustadtelite = 900.37 barns/electronU=PENeustadtelite x r Electron Density=4,609.34 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Neustadtelite is Not Radioactive
Neustadtelite Classification
Dana Class:
41.04.09.02 (41) Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
(41.04) where (A B)5 (XO4)2 Zq
(41.04.09) Medenbachite Group
41.04.09.01 Medenbachite ! Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2 P1 1
41.04.09.02 Neustadtelite ! Bi2Fe(Fe,Co)(O,OH)2(OH)2(AsO4)2 P1 1
41.04.09.03 Cobaltneustadtelite ! Bi2Fe(Co,Fe)(O,OH)2(OH)2(AsO4)2 P1 1
Strunz Class:
08.BK.10 08 - PHOSPHATES, ARSENATES, VANADATES
08.B - Phosphates, etc. with Additional Anions, without H2O
08.BK -With medium-sized and large cations, (OH, etc.)
08.BK.10 Medenbachite ! Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2 P1 1
08.BK.10 Cobaltneustadtelite ! Bi2Fe(Co,Fe)(O,OH)2(OH)2(AsO4)2 P1 1
08.BK.10 Neustadtelite ! Bi2Fe(Fe,Co)(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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Neustadtelite
Bi2Fe+++(Fe+++,Co)(O,OH)2(OH)2(AsO4)2
Dana No: 41.04.09.02 Strunz No: 08.BK.10
Locality:
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