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Katoptrite

A valid IMA mineral species - grandfathered
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About KatoptriteHide

Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Colour:
black; fire-red (thin sections); red in transmitted light
Lustre:
Metallic
Hardness:
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 IdentifiersHide

Mindat ID:
2169
Long-form identifier:
mindat:1:1:2169:8
GUID
(UUID V4):
f94c0b97-33ac-4e10-91a9-d72337b66527

IMA Classification of KatoptriteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+13Al4Sb5+2O20(SiO4)2

Classification of KatoptriteHide

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

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
KttIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KatoptriteHide

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.
Density:
4.56 g/cm3 (Measured)    4.65 g/cm3 (Calculated)

Optical Data of KatoptriteHide

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.
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 KatoptriteHide

Mindat Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Common Impurities:
Fe,Ca,H2O

Crystallography of KatoptriteHide

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)°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014705KatoptriteMoore 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 47-611976Langban, Sweden0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of KatoptriteHide

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 KatoptriteHide

Other Language Names for KatoptriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Katoptrite associated with SonoliteMn2+9(SiO4)4(OH)2
4 photos of Katoptrite associated with CalciteCaCO3
3 photos of Katoptrite associated with JacobsiteMn2+Fe3+2O4
1 photo of Katoptrite associated with BlatteriteSb5+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 PyrochroiteMn(OH)2
1 photo of Katoptrite associated with Manganostibite(Mn,Fe)7SbAsO12

Related Minerals - Strunz-mindat GroupingHide

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2OOrth.
9.AE.10EuclaseBeAl(SiO4)(OH)Mon. 2/m : P21/b
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
9.AE.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon. 2/m : P21/b
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2Orth. mmm (2/m 2/m 2/m)
9.AE.30ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
9.AE.35StringhamiteCaCu(SiO4) · H2OMon. 2/m : P21/b
9.AE.45YeatmaniteZn6Mn2+9Sb5+2(SiO4)4O12Tric. 1 : P1
9.AE.50SphaerobertranditeBe3(SiO4)(OH)2Mon. 2/m : P21/b

Other InformationHide

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

References for KatoptriteHide

Localities for KatoptriteHide

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

- 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.
Sweden
 
  • Örebro County
    • Hällefors
      • Grythyttan
Igelström (1885) +2 other references
  • Värmland County
    • Filipstad
      • Långban Ore District
Holtstam et al. (1999) +1 other reference
Gatedal (2003)
      • Nordmark mining district
        • Jakobsberg ore field
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.
 
矿物 and/or 产地  
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