Örebroite
A valid IMA mineral species
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About Örebroite
Örebro Castle
Formula:
Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3
Colour:
dark brown, red brown
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
4.77 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Named by Pete J. Dunn, Donald R. Peacor, Richard C. Erd, and Robert A. Ramik in 1986 for the city of Örebro, Sweden, 60 km southeast of the type locality of Sjö Mine.
Type Locality:
Mineral is close to franciscanite and welinite. Chemically resembles scorticoite and UM2003-37-SiO:HMnSbZn.
Name Encoding
ASCII-7:
Orebroite
Unique Identifiers
Mindat ID:
3054
Long-form identifier:
mindat:1:1:3054:6
Similar Names
| Örebroite-III | Mn62+(Fe3+,Sb5+)2Si2(O,OH)14 |
IMA Classification of Örebroite
Approved
IMA Formula:
Mn2+6(Sb5+Fe3+)(SiO4)2O6
Approval year:
1985
First published:
1986
Classification of Örebroite
9.AF.75
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.4.1.1
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
14.18.40
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
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 |
|---|---|---|
| Öbr | 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 Örebroite
Vitreous
Transparency:
Opaque
Colour:
Dark brown, red brown
Streak:
Reddish brown
Hardness:
4 on Mohs scale
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.77 g/cm3 (Calculated)
Optical Data of Örebroite
Type:
Uniaxial (+)
RI values:
nω = 1.857(3) nε = 1.875(3)
Max. Birefringence:
δ = 0.018
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Pleochroism:
Weak
Chemistry of Örebroite
Mindat Formula:
Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3
Element Weights:
Crystallography of Örebroite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 8.183(7) Å, c = 4.756(9) Å
Ratio:
a:c = 1 : 0.581
Unit Cell V:
275.80 ų (Calculated from Unit Cell)
Z:
2
Morphology:
fine-grained, polycrystalline intergrowths and massive
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.096 Å | (100) |
| 1.778 Å | (90) |
| 2.334 Å | (70) |
| 2.838 Å | (50) |
| 1.550 Å | (50) |
| 2.680 Å | (40) |
| 4.08 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Örebroite
General Appearance of Type Material:
Massive and polycrystalline
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden, RM. 93:0255.
National Museum of Natural History, Washington, D.C., USA, 163008.
National Museum of Natural History, Washington, D.C., USA, 163008.
Associated Minerals at Type Locality:
Synonyms of Örebroite
Other Language Names for Örebroite
Relationship of Örebroite to other Species
Member of:
Other Members of Welinite Group:
| Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 | Trig. 3 : P3 |
| Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 | Trig. 3 : P3 |
| Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 | Trig. 3 : P3 |
| Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 | Trig. 3 : P3 |
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | 'Xenolite' | Al10Si8O31 |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.50 | 'Unnamed (Ca-analogue of Humite)' | Ca7(SiO4)4F2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.50 | 'Unnamed (OH-analogue of humite)' | Mg7(SiO4)3(OH)2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Magnesiochloritoid | MgAl2O(SiO4)(OH)2 |
| 9.AF.85 | Ottrélite | Mn2+Al2O(SiO4)(OH)2 |
| 9.AF.85 | Chloritoid | Fe2+Al2O(SiO4)(OH)2 |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Other Information
Notes:
Weakly magnetic, but thought to be inclusions of magnetite and not the Örebroite itself.
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 Örebroite
mindat.org URL:
https://www.mindat.org/min-3054.html
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References for Örebroite
Reference List:
Localities for Örebroite
Showing 2 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) | |
| Dunn et al. (1986) +1 other reference |
USA | |
| Flohr et al. (1992) |
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Sjögruvan, Grythyttan, Hällefors, Örebro County, Sweden