Igelströmite
A valid IMA mineral species
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About Igelströmite
Lars Johan Igelström
Formula:
Fe3+(Sb3+Pb2+)O4
Colour:
dark reddish-brown to black
Lustre:
Sub-Metallic
Hardness:
3 - 4
Specific Gravity:
6.33 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Named after Lars Johan Igelström (February 10 , 1822 at Yngshyttan near Persberg - May 15, 1897 at Gräs, Sunnemo parish , Värmland), who demonstrated the existence of manganese ores at Långban and the nearby mineral localities Harstigen, Pajsberg, Nordmark, Jakobsberg and Sjögruvan. Among other things, he was also the first geologist to note the peculiar occurrence of native lead at Långban in 1871. The mineral name igelströmite has been used twice previously: first, as a synonym never given species status (and misspelled “ingelstromite”), for a colour variety of pyroaurite (Heddle, 1878), a mineral originally described by Igelström (1865) from Långban, and the second time by Weibull (1883) for an intermediate member of the tephroite–fayalite series with composition range 20 %–40 % Mn2SiO4, and thus it was never accepted as a separate species.
Known synthetic analogue. Unique combination of elements (among the approved species, at the upload time).
Rare mineral found on four specimens from 25,000 ore specimens.
With a good probability, the specimens of the two new minerals originate from the Hindenburg working in the mine, where most of the nadorite specimens of the present type were encountered (Flink, 1923). The label assigned to the igelströmite type sample states the Japan drift, but this might be an error, a mere confusion through the association with Flink's no. 66. Hindenburg was mined for Fe and Mn ore at the 150 m level, from 1916 to 1928 and was finally worked through into the England stope at the 165 m level (Magnusson, 1930).
Rare mineral found on four specimens from 25,000 ore specimens.
With a good probability, the specimens of the two new minerals originate from the Hindenburg working in the mine, where most of the nadorite specimens of the present type were encountered (Flink, 1923). The label assigned to the igelströmite type sample states the Japan drift, but this might be an error, a mere confusion through the association with Flink's no. 66. Hindenburg was mined for Fe and Mn ore at the 150 m level, from 1916 to 1928 and was finally worked through into the England stope at the 165 m level (Magnusson, 1930).
Name Encoding
ASCII-7:
Igelstromite
Unique Identifiers
Mindat ID:
55548
Long-form identifier:
mindat:1:1:55548:1
Similar Names
| Igelströmite (of Heddle) | A synonym of Pyroaurite |
| Igelströmite (of Weibull) | A synonym of 'Knebelite' |
IMA Classification of Igelströmite
Approved
Approval year:
2021
Type description reference:
Holtstam, Dan; Langhof, Jörgen; Friis, Henrik; Karlsson, Andreas; Erambert, Muriel (2024) Igelströmite, Fe3+(Sb3+Pb2+)O4, and manganoschafarzikite, Mn2+Sb3+2O4, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden. European Journal of Mineralogy, 36 (2). 311-322 doi:10.5194/ejm-36-311-2024
Classification of Igelströmite
4.JA.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ig | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Igelströmite
Sub-Metallic
Transparency:
Translucent
Colour:
dark reddish-brown to black
Streak:
Yellowish brown to dark brown
Hardness:
3 - 4 on Mohs scale
Comment:
in analogy with schafarzikite.
Tenacity:
Brittle
Cleavage:
Distinct/Good
distinct/good on {110}
distinct/good on {110}
Fracture:
Irregular/Uneven, Conchoidal
Density:
6.33(1) g/cm3 (Calculated)
Chemistry of Igelströmite
Mindat Formula:
Fe3+(Sb3+Pb2+)O4
Element Weights:
Elements listed:
Crystallography of Igelströmite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mbc
Setting:
P42/mbc
Cell Parameters:
a = 8.4856(2) Å, c = 6.0450(3) Å
Ratio:
a:c = 1 : 0.712
Unit Cell V:
435.27 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.25 Å | (14) |
| 3.21 Å | (100) |
| 3.01 Å | (13) |
| 2.687 Å | (20) |
| 2.462 Å | (22) |
| 1.946 Å | (19) |
| 1.778 Å | (14) |
| 1.667 Å | (16) |
Reference:
Holtstam, Dan; Langhof, Jörgen; Friis, Henrik; Karlsson, Andreas; Erambert, Muriel (2024) Igelströmite, Fe3+(Sb3+Pb2+)O4, and manganoschafarzikite, Mn2+Sb3+2O4, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden. European Journal of Mineralogy, 36 (2). 311-322 doi:10.5194/ejm-36-311-2024
Type Occurrence of Igelströmite
General Appearance of Type Material:
lenticular crystals forming compact crystal aggregates of rounded appearance, up to 1 mm across
Place of Conservation of Type Material:
mineralogical collections of (1) the Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden, collection number GEO-NRM 19255056 (holotype), and (2) the Natural History Museum, University of Oslo, NHM Økern, Kabelgata 38-40, 0580 Oslo, Norway, catalogue number KNR 44278 (cotype)
Geological Setting of Type Material:
distinct hausmannite–braunite and magnetite–hematite ore bodies are hosted by Palaeoproterozoic (∼ 1.9 Ga) dolomitic marbles.
Associated Minerals at Type Locality:
Reference:
Holtstam, Dan; Langhof, Jörgen; Friis, Henrik; Karlsson, Andreas; Erambert, Muriel (2024) Igelströmite, Fe3+(Sb3+Pb2+)O4, and manganoschafarzikite, Mn2+Sb3+2O4, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden. European Journal of Mineralogy, 36 (2). 311-322 doi:10.5194/ejm-36-311-2024
Synonyms of Igelströmite
Other Language Names for Igelströmite
Dutch:Igelströmiet
German:Igelströmit
Relationship of Igelströmite to other Species
Member of:
Other Members of Minium Group:
| Manganoschafarzikite | MnSb2O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
| Minium | Pb3O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
| Schafarzikite | Fe2+Sb3+2O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
| Trippkeite | Cu2+As3+2O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
Common Associates
Associations Based on Photo Data:
| 1 photo of Igelströmite associated with Nadorite | PbSbClO2 |
| 1 photo of Igelströmite associated with Rhodochrosite | MnCO3 |
Related Minerals - Strunz-mindat Grouping
| 4.JA.05 | Leiteite | Zn(As2O4) |
| 4.JA.10 | Reinerite | Zn3(AsO3)2 |
| 4.JA.15 | Karibibite | Fe3+3(As3+O2)4(As3+2O5)(OH) |
| 4.JA.20 | Manganoschafarzikite | MnSb2O4 |
| 4.JA.20 | Trippkeite | Cu2+As3+2O4 |
| 4.JA.20 | Schafarzikite | Fe2+Sb3+2O4 |
| 4.JA.20 | Kusachiite | CuBi2O4 |
| 4.JA.25 | Apuanite | Fe2+Fe3+4Sb3+4O12S |
| 4.JA.30 | Versiliaite | Fe2Fe4Sb6O16S |
| 4.JA.35 | Schneiderhöhnite | Fe2+Fe3+3As3+5O13 |
| 4.JA.40 | Zimbabweite | (Na,K)2PbAs4(Ta,Nb,Ti)4O18 |
| 4.JA.45 | Ludlockite | PbFe3+4As3+10O22 |
| 4.JA.50 | Paulmooreite | Pb2[As2O5] |
| 4.JA.55 | Stibivanite | Sb2VO5 |
| 4.JA.60 | Chadwickite | (UO2)[HAsO3] |
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.
Internet Links for Igelströmite
mindat.org URL:
https://www.mindat.org/min-55548.html
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References for Igelströmite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2021) Newsletter 62. Mineralogical Magazine, 85 (4) 634-638 doi:10.1180/mgm.2021.62
Holtstam, Dan; Langhof, Jörgen; Friis, Henrik; Karlsson, Andreas; Erambert, Muriel (2024) Igelströmite, Fe3+(Sb3+Pb2+)O4, and manganoschafarzikite, Mn2+Sb3+2O4, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden. European Journal of Mineralogy, 36 (2). 311-322 doi:10.5194/ejm-36-311-2024
Localities for Igelströmite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Sweden (TL) | |
| Miyawaki et al. (2021) +1 other reference |
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Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden