Katoptrite (original) (raw)
A valid IMA mineral species - grandfathered
About KatoptriteHide
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Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Colour:
black; fire-red (thin sections); red in transmitted light
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 IdentifiersHide
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Long-form identifier:
mindat:1:1:2169:8
f94c0b97-33ac-4e10-91a9-d72337b66527
IMA Classification of KatoptriteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+13Al4Sb5+2O20(SiO4)2
Classification of KatoptriteHide
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9.AE.40
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
17.7.17
17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
Mineral SymbolsHide
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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 KatoptriteHide
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Colour:
Black; fire-red (thin sections); red in transmitted light
Cleavage:
Perfect
On {001}, perfect, micaceous.
Density:
4.56 g/cm3 (Measured) 4.65 g/cm3 (Calculated)
Optical Data of KatoptriteHide
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RI values:
_n_α = 1.920 _n_β = 1.950 _n_γ = 1.950
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
X ≃ ⊥ {001}; Y = b; Z ∧ a = -3°.
Comments:
Red-brown to orange.
Chemistry of KatoptriteHide
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Mindat Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Common Impurities:
Fe,Ca,H2O
Crystallography of KatoptriteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 5.617(2) Å, b = 23.02(2) Å, c = 9.079(6) Å
β = 101.38(3)°
Ratio:
a:b:c = 0.244 : 1 : 0.394
Unit Cell V:
1,150.87 ų (Calculated from Unit Cell)
Morphology:
Crystals commonly tabular {010}, elongated [100], [101], or equant. Minute grains or anhedral masses.
Crystal StructureHide
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| 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 DiffractionHide
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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 EnvironmentHide
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Type Occurrence of KatoptriteHide
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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:
Associated Minerals at Type Locality:
Synonyms of KatoptriteHide
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Other Language Names for KatoptriteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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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 KatoptriteHide
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References for KatoptriteHide
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Reference List:
**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**p.1030 - as catoptrite
Localities for KatoptriteHide
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This 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.
Locality ListHide
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