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
GUID
(UUID V4):
(UUID V4):
f94c0b97-33ac-4e10-91a9-d72337b66527
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 |
---|---|---|
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 = 1.920 nβ = 1.950 nγ = 1.950
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
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
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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-𝑇 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
Associated Minerals Based on Photo Data:
7 photos of Katoptrite associated with Sonolite | Mn2+9(SiO4)4(OH)2 |
4 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 Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 |
1 photo of Katoptrite associated with Pyrochroite | Mn(OH)2 |
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:
Localities for Katoptrite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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) | |
| Geologiska Föreningens i Stockholm. Förhandlingar (1917) +2 other references |
Nysten (1987) +1 other reference | |
Holtstam et al. (1998) | |
Peter Andresen collection. |
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Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden