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Neustädtelite

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Güldener Falk Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany
© 2004 JBS

Show Neustädtelite Photos (5)
Formula:
Bi
3+
2
Fe
3+
 
(Fe
3+
 
,Co)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
System:TriclinicColour:Brown, brown-red, black
Lustre:AdamantineHardness:4½
Name:For the type locality


Ferric iron (Fe3+) analogue of Medenbachite.

Classification of Neustädtelite

IMA status:Approved 1998
Strunz 8th edition ID:7/B.37-15
Strunz 9th edition ID:8.BK.10
Nickel-Strunz 10th (pending) edition ID:8.BK.10

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
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Type Occurrence of Neustädtelite

Type Locality:Güldener Falk Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany

Physical Properties of Neustädtelite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent, Translucent
Colour:Brown, brown-red, black
Streak:Light brown
Hardness (Mohs):4½
Cleavage:Distinct/Good
on {001}
Density (calculated):5.81 g/cm3

Crystallography of Neustädtelite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 4.556Å, b = 6.153Å, c = 8.894Å
α = 95.43°, β = 99.22°, γ = 92.95°
Ratio:a:b:c = 0.74 : 1 : 1.445
Unit Cell Volume:V 244.437 ų
Z:1
X-Ray Powder Diffraction:
d-spacingIntensity
8.864 (30)
3.772 (90)
3.539 (100)
3.495 (70)
2.913 (70)
2.797 (50)
2(

Optical Data of Neustädtelite

Type:Biaxial (-)
RI values: nα = 2.020 nβ = 2.080 nγ = 2.120
Maximum Birefringence:δ = 0.100

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:relatively weak

Chemical Properties of Neustädtelite

Formula:
Bi
3+
2
Fe
3+
 
(Fe
3+
 
,Co)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
Essential elements:As, Bi, Fe, H, O
All elements listed in formula:As, Bi, Co, Fe, H, O

Relationship of Neustädtelite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BK.05Brazilianite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
8.BK.10Medenbachite
Bi
3+
2
Fe
3+
 
(Cu,Fe
3+
 
)[(OH,O)
 
2
|AsO
 
4
]
 
2
8.BK.10Cobaltneustädtelite
Bi
3+
2
Fe
3+
 
(Co,Fe
3+
 
)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
8.BK.15Curetonite
Ba
 
4
Al
 
3
Ti(PO
 
4
)
 
4
(O,OH)
 
6
8.BK.20Heyite
Pb
 
5
Fe
2+
2
[O
 
2
|VO
 
4
]
 
2
8.BK.25Jamesite
Pb
 
2
Zn(Fe
2+
 
,Zn)
 
2
Fe
3+
4
[(OH)
 
10
|(AsO
 
4
)
 
4
]
8.BK.25Lulzacite
Sr
 
2
Fe
2+
 
(Fe
2+
 
,Mg)
 
2
Al
 
4
[(OH)
 
10
|(PO
 
4
)
 
4
]

Other Names for Neustädtelite

Synonyms:
IMA1998-016
Other Languages:
German:Neustädtelit
Russian:Нойштадтелит
Spanish:Neustädtelita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Neustädtelite

Reference List:Mitt. Osterreich Mineral. Gesellshaft (2001): 146: 157-159.

Krause, W., H.-J. Bernhardt, C. McCammon & H. Effenberger (2002): Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+- analogues of medenbachite.- American Mineralogist: 87: 726-738.

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    Localities for Neustädtelite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Bavaria
      • Franconia
        • Franconian Forest
          • Bad Steben
            • Lichtenberg
              • Lichtenberg Copper Mines
    		Lapis 27(7/8):76 (2002)
    • Saxony
      • Erzgebirge
        • Schneeberg District
          • Neustädtel
    		Lapis 30(7/8):68-69 (2005)
    Lapis 30(7/8):41-70 (2005)
    W. Krause, H.-J. Bernhardt, C. McCammon & H. Effenberger (2002): Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+- analogues of medenbachite.- American Mineralogist 87, 726 - 738
    Am. Min. 87:726-738
    Lapis 30(7/8):68-69 (2005)
    Lapis 30(7/8):68-69 (2005)
    Lapis 30(7/8):68-69 (2005)
    Lapis 30(7/8):68-69 (2005)
    Lapis 30(7/8):68-69 (2005)
          • Wolfgang Maaßen Mine field
    		Am. Min. 87:726-738
    Lapis 30(7/8):68-69 (2005)
      • Vogtland
        • Oelsnitz
    		Gröbner, J. and Kolitsch, U. (2007): The minerals of the uranium prospect at Tirpersdorf, Vogtland. Lapis 32, 37-42; 58. (in German)
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