Katoptrite
A valid IMA mineral species - grandfathered
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About Katoptrite
Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Colour:
black; fire-red (thin sections); red in transmitted light
Lustre:
Metallic
Hardness:
5½
Specific Gravity:
4.56
Crystal System:
Monoclinic
Name:
From the Greek κάτοπτρου for "mirror" in allusion to the glassy reflections off its cleavages.
This page provides mineralogical data about Katoptrite.
Unique Identifiers
Mindat ID:
2169
Long-form identifier:
mindat:1:1:2169:8
IMA Classification of Katoptrite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+13Al4Sb5+2O20(SiO4)2
Classification of Katoptrite
9.AE.40
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
44.3.5.1
44 : ANTIMONATES
3 : Miscellaneous
44 : ANTIMONATES
3 : Miscellaneous
17.7.17
17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
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 |
|---|---|---|
| Ktt | 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 Katoptrite
Metallic
Transparency:
Opaque
Comment:
Lustre brilliant
Colour:
Black; fire-red (thin sections); red in transmitted light
Streak:
Red brown
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {001}, perfect, micaceous.
On {001}, perfect, micaceous.
Density:
4.56 g/cm3 (Measured) 4.65 g/cm3 (Calculated)
Optical Data of Katoptrite
Type:
Biaxial (-)
RI values:
nα = 1.92 nβ = 1.95 nγ = 1.95
Max. Birefringence:
δ = 0.030
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v strong
Optical Extinction:
X ≃ ⊥ {001}; Y = b; Z ∧ a = -3°.
Pleochroism:
Strong
Comments:
Red-brown to orange.
Comments:
2V small.
Chemistry of Katoptrite
Mindat Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Element Weights:
Common Impurities:
Fe,Ca,H2O
Crystallography of Katoptrite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.617(2) Å, b = 23.02(2) Å, c = 9.079(6) Å
β = 101.38(3)°
β = 101.38(3)°
Ratio:
a:b:c = 0.244 : 1 : 0.394
Unit Cell V:
1,150.87 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals commonly tabular {010}, elongated [100], [101], or equant. Minute grains or anhedral masses.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014705 | Katoptrite | Moore P B, Araki T, Brunton G D (1976) Catoptrite, (Mn2+5Sb5+2)VI(Mn2+8Al4Si2)IVO28, a novel close-packed oxide sheet structure Neues Jahrbuch fur Mineralogie, Abhandlungen 127 47-61 | 1976 | Langban, Sweden | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.957 Å | (100) |
| 8.88 Å | (65) |
| 2.600 Å | (50) |
| 4.43 Å | (45) |
| 2.488 Å | (45) |
| 2.810 Å | (40) |
| 1.944 Å | (35) |
Comments:
Brattfors mine, Sweden. The data are from Moore (1966).
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 Katoptrite
General Appearance of Type Material:
Small brown rectangular crystal plates.
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden, number 172542 (holotype).
Geological Setting of Type Material:
Metamorphosed limestone.
Associated Minerals at Type Locality:
Synonyms of Katoptrite
Other Language Names for Katoptrite
Common Associates
Associations Based on Photo Data:
| 8 photos of Katoptrite associated with Sonolite | Mn2+9(SiO4)4(OH)2 |
| 5 photos of Katoptrite associated with Calcite | CaCO3 |
| 3 photos of Katoptrite associated with Jacobsite | Mn2+Fe3+2O4 |
| 1 photo of Katoptrite associated with Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
| 1 photo of Katoptrite associated with Pyrochroite | Mn(OH)2 |
| 1 photo of Katoptrite associated with Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 |
| 1 photo of Katoptrite associated with Manganostibite | (Mn,Fe)7SbAsO12 |
Related Minerals - Strunz-mindat Grouping
| 9.AE.05 | Beryllite | Be3(SiO4)(OH)2 · H2O |
| 9.AE.10 | Euclase | BeAl(SiO4)(OH) |
| 9.AE.15 | Sverigeite | NaMnMgSnBe2(SiO4)3(OH) |
| 9.AE.20 | Hodgkinsonite | Mn2+Zn2(SiO4)(OH)2 |
| 9.AE.25 | Gerstmannite | MnMgZn(SiO4)(OH)2 |
| 9.AE.30 | Clinohedrite | CaZn(SiO4) · H2O |
| 9.AE.35 | Stringhamite | CaCu(SiO4) · H2O |
| 9.AE.45 | Yeatmanite | Zn6Mn2+9Sb5+2(SiO4)4O12 |
| 9.AE.50 | Sphaerobertrandite | Be3(SiO4)(OH)2 |
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 Katoptrite
mindat.org URL:
https://www.mindat.org/min-2169.html
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Please feel free to link to this page.
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References for Katoptrite
Reference List:
Igelström, Lars Johan (1885) Haematostibiite, nouveau minéral de la mine de Sjœgrufvan, paroisse Grythyttan, gouvernement d'Œrebro (Suède). Bulletin de la Société française de Minéralogie, 8 (6). 143-145 doi:10.3406/bulmi.1885.1932(as hematostibite)
Flink, Gustaf (1917) 2. Katoprit, ein neues Mineral von Nordmarken [2. Katoprite, a new mineral from Nordmark], in Einige Neuigkeiten in schwedischer Mineralogie. Geologiska Föreningen i Stockholm Förhandlingar, 39 (4) 431-438 doi:10.1080/11035891709444846
Larsen, E.S.; Berman, H. (1934) The microscopic determination of the nonopaque minerals. Bulletin of the US Geological Survey Vol. 848. US Geological Survey p.1-266. doi:10.3133/b848 p.206
Young, Edward J., Munson, Elaine L. (1966) Fluor-chlor-oxy-apatite and sphene from Crystal Lode pegmatite, near Eagle, Colorado. American Mineralogist, 51 (9-10) 1476-1493 p.1484
Localities for Katoptrite
Showing 9 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 | |
| Igelström (1885) +2 other references |
| Holtstam et al. (1999) +1 other reference |
| Gatedal (2003) | |
| MinMag 62 +1 other reference |
| Nysten (1987) | |
| Flink (1917) +3 other references |
| Nysten (1987) +1 other reference | |
| Holtstam et al. (1998) | |
| Peter Andresen collection |
Quick NavTopAbout KatoptriteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden