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Ferrostalderite

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Formula:
CuFe2TlAs2S6
System:
Tetragonal
Colour:
Black
Lustre:
Metallic
Name:
For it's relation to stalderite.
The iron analogue of stalderite. Unique combination of elements.

Structure and crystallochemistry details (Biagioni et al., 2016): Cu present in the M1 and Zn in M2 site; the framework is built of (Cu,Fe)-centered tetrahedra and has channels (parallel to [001]) where dissimetric TlS6 and (As,Sb)S3 polyhedra reside.


Classification of Ferrostalderite

Approved
Approval Year:
2014

Physical Properties of Ferrostalderite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black

Chemical Properties of Ferrostalderite

Formula:
CuFe2TlAs2S6
Elements listed in formula:
Analytical Data:
From type description. The empirical formula is calcullated on the basis of 12 atoms per formula unit.
Cu 6.24(25)
Ag 4.18(9)
Fe 9.95(83)
Zn 4.46(91)
Hg 1.22(26)
Tl 26.86(62)
As 19.05(18)
Sb 0.63(6)
S 25.39(47)
total 97.98(72) wt%

Crystallography of Ferrostalderite

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2m
Cell Parameters:
a = 9.8786(5) Å, c = 10.8489(8) Å
Ratio:
a:c = 1 : 1.098
Unit Cell Volume:
V 1058.71 ų
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.092(70)
3.493(23)
3.396(35)
3.124(17)
2.937(100)
2.656(19)
2.470(19)
2.435(33)
Comments:
From Type Description.

Type Occurrence of Ferrostalderite

General Appearance of Type Material:
Crystals, equant to prismatic, up to 50 µm
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collection of the Museo di Storia Naturale, Università di Firenze, Via La Pira 4, Firenze, Italy, catalogue number 3148/I
Empirical Formula:
Cu0.75(2)Ag0.30(1)Fe1.36(10)Zn0.52(11)Hg0.05(1)Tl1.00(1)[As1.94(4)Sb0.04(1)]∑1.98(4)S6.04(4)
Associated Minerals at Type Locality:

Relationship of Ferrostalderite to other Species

Other Members of Group:
ArsiccioiteAgHg2Tl(As,Sb)2S6
RalphcannoniteAgZn2TlAs2S6
RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6
StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6

Other Names for Ferrostalderite

Name in Other Languages:

Other Information

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

References for Ferrostalderite

Reference List:
Bindi, L., Biagioni, C., Nestola, F., Cannon, R., Roth, P. Raber, T. (2015) Ferrostalderite, IMA 2014-090. CNMNC Newsletter No. 24, April 2015, page 248. Mineralogical Magazine: 79: 247-251.

Biagioni, C., Bindi, L., Nestola, F., Cannon, R., Roth, P., Raber, T. (2016) Ferrostalderite, CuFe2TlAs2S6, a new mineral from Lengenbach, Switzerland: occurrence, crystal structure, and emphasis on the role of iron in sulfosalts. Mineralogical Magazine: 80: 175-186.

Internet Links for Ferrostalderite

mindat.org URL:
https://www.mindat.org/min-46561.html
Please feel free to link to this page.

Localities for Ferrostalderite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Bindi, L., Biagioni, C., Nestola, F., Cannon, R., Roth, P. and Raber, T. (2015) Ferrostalderite, IMA 2014-090. CNMNC Newsletter No. 24, April 2015, page 248; Mineralogical Magazine, 79, 247-251;Biagioni, C., Bindi, L., Nestola, F., Cannon, R., Roth, P., Raber, T. (2016) Ferrostalderite, CuFe2TlAs2S6, a new mineral from Lengenbach, Switzerland: occurrence, crystal structure, and emphasis on the role of iron in sulfosalts. Mineralogical Magazine: 80: 175-186
Mineral and/or Locality  
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