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Neustädtelite

A valid IMA mineral species
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Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4
Colour:
Brown, brown-red, black
Lustre:
Adamantine
Hardness:
4½
Specific Gravity:
5.81 (Calculated)
Crystal System:
Triclinic
Name:
For the type locality
Type Locality:
ⓘGüldener Falk Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany
Ferric iron (Fe3+) analogue ofMedenbachite.


Unique Identifiers
IMA Formula:
Bi2Fe3+(Fe3+,Co)2(O,OH)4(AsO4)2
Approval year:
1998
First published:
2002
Type description reference:
Krause, Werner, Bernhardt, Heinz-Jürgen, McCammon, Catherine, Effenberger, Herta (2002) Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+-analogues of medenbachite.American Mineralogist, 87 (5) 726-738doi:10.2138/am-2002-5-616

Classification of Neustädtelite

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1

Mineral Symbols
Transparency:
Transparent, Translucent
Colour:
Brown, brown-red, black
Streak:
Light brown
Hardness:
4½ onMohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {001}
Fracture:
Conchoidal
Density:
5.81 g/cm3 (Calculated)

Optical Data of Neustädtelite
Surface Relief:
Moderate
Dispersion:
relatively weak
Pleochroism:
Strong
Comments:
X = brown to opaque, Y = yellow, and Z = pale yellow.
Comments:
X is very near to [010]; for crystals lying on (001) X' shows an oblique extinction of approximately 7° relative to [010].

Chemistry of Neustädtelite

Crystallography of Neustädtelite
General Appearance of Type Material:
Crystal aggregates up to 0.3 mm and very small tabular crystals, mostly<0.1 mm.
Place of Conservation of Type Material:
Staatliches Museum für Mineralogie und Geologie, Dresden, Germany, catalogue numbers 18328 and 18329.
Associated Minerals at Type Locality:
BismutiteGoethiteMixitePreisingeriteQuartz
Zeunerite
Reference:
Krause, Werner, Bernhardt, Heinz-Jürgen, McCammon, Catherine, Effenberger, Herta (2002) Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+-analogues of medenbachite.American Mineralogist, 87 (5) 726-738doi:10.2138/am-2002-5-616

Synonyms of Neustädtelite

Other Language Names for Neustädtelite

Common AssociatesMon. 2/m8.BK.10CobaltneustädteliteBi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4Tric.1 :P18.BK.10MedenbachiteBi2Fe3+Cu2+(AsO4)2O(OH)3Tric.1 :P18.BK.15CuretoniteBa(Al,Ti)(PO4)(OH,O)FMon. 2/m8.BK.20HeyitePb5Fe2+2(VO4)2O4Mon. 2/m :P21/m8.BK.25JamesitePb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10Tric.1 :P18.BK.25LulzaciteSr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10Tric.1 :P18.BK.25DésoritePb2(Fe3+6Zn)O2(PO4)4(OH)8Tric.1 :P18.BK.30NishanbaeviteKAl2O(AsO4)(SO4)Orth.mmm(2/m2/m2/m) :Pbcm8.BK.35ZircarsiteNa18Cu12ZrO8(AsO4)8Cl6Iso.m3m(4/m32/m) :Pm3m8.BK.35ArsmiranditeNa18Cu12Fe3+O8(AsO4)8Cl5Mon. 2/m :B2/m8.BK.35LebedeviteK4Na14Cu14O8(AsO4)8Cl6Tet. 4/mmm(4/m2/m2/m) :I4/mmm8.BK.35Lehmannite Na18Cu12TiO8(AsO4)8FCl5Mon. 2/m :B2/m

Fluorescence of Neustädtelite

Other Information
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    • References for NeustädteliteⓘCobalt areaCarnegie Museum of Natural History ...
    Czech Republic
     
    Pavel Škácha coll.+1 other referenceSejkora (2024)
    Germany
     
    90.+1 other reference90.+1 other referenceLapis 27 (7/8)Hajek (2010)Lapis 30 (7/8)Lapis 30 (7/8)+1 other referenceMassanek et al. (2005)Krause et al. (2002)Am. Min. 87:726-738Lapis 30 (7/8)Lapis 30 (7/8)Lapis 30 (7/8)Lapis 30 (7/8)Am. Min. 87:726-738Lapis 30 (7/8)Gröbner et al. (2007)+1 other reference
    Spain
     
    Calvo Rebollar et al. (2022)Calvo Rebollar et al. (2022)
    UK
     
    Steve Rust collection
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