Katoptrite Mineral Data

Katoptrite Mineral Data +

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General Katoptrite Information

Chemical Formula:

(Mn,Mg)13(Al,Fe+++)4Sb+++++2Si2O28

Composition:

Molecular Weight = 1,553.59 gm

Magnesium 2.19 % Mg 3.63 % MgO

Manganese 41.37 % Mn 53.42 % MnO

Aluminum 5.73 % Al 10.83 % Al₂O₃

Iron 1.80 % Fe 2.57 % Fe₂O₃

Silicon 3.62 % Si 7.73 % SiO₂

Antimony 16.46 % Sb 21.86 % Sb₂O₅

Oxygen 28.84 % O

______ ______

100.00 % 100.05 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_11.7Mg_1.4Al_3.3Fe³⁺_0.5Sb_2.1Si₂O₂₈

Environment:

In metamorphosed limestones.

IMA Status:

Valid Species (Pre-IMA) 1917

Locality:

Brattfors, Moss, and Jakobsberg mines, near Nordmark, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "mirror", for the perfectly reflecting cleavage surfaces.

Synonym:

Catoptrite

ICSD 121137

PDF 19-274

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Katoptrite Crystallography

Axial Ratios:

a:b:c =0.244:1:0.3943

Cell Dimensions:

a = 5.617, b = 23.02, c = 9.079, Z = 2; beta = 101.383° V = 1,150.85 Den(Calc)= 4.48

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.96(1), 8.88(0.65), 4.43(0.45),

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Crystal Structure:

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Moore P B , Araki T , Brunton G D , Neues Jahrbuch fur Mineralogie, Abhandlungen , 127 (1976) p.47-61, Catoptrite, (Mn2+5Sb5+2)VI(Mn2+8Al4Si2)IVO28,, a novel close-packed oxide sheet structure, Locality: Langban, Sweden

Physical Properties of Katoptrite

Cleavage:

[001] Perfect

Color:

Black, Red.

Density:

4.56

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Streak:

red brown

Optical Properties of Katoptrite

Gladstone-Dale:

CI meas= -0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.09 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2098,KPDmeas= 0.2061,KC= 0.1926

Optical Data:

Biaxial (-), a=1.92, b=1.95, g=1.95, bire=0.0300, 2V(Calc)=0, 2V(Meas)=0-5. Dispersion r > v strong.

Pleochroism (x):

strong red brown.

Pleochroism (z):

strong orange.

Calculated Properties of Katoptrite

Electron Density:

r_electron=4.25 gm/cc
note: r_Katoptrite=4.56 gm/cc.

Fermion Index

Fermion Index = 0.00439
Boson Index = 0.99561

Photoelectric:

PE_Katoptrite= 63.79 barns/electron
U=PE_Katoptrite x r_electron= 271.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Katoptrite is Not Radioactive

Katoptrite Classification

Dana Class:

44.3.5.1 (44)Antimonates

(44.3)with miscellaneous formulae

(44.3.5)Dana Group

44.3.5.1 Katoptrite (Mn,Mg)13(Al,Fe)4Sb2Si2O28 C 2/m 2/m

Strunz Class:

VIII/B.09-30 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.09 - Braunite - Langbanite - Katoptrite series

VIII/B.09-03 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-05 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-07 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-10* Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

VIII/B.09-10 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) P 3 3

VIII/B.09-12* Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

VIII/B.09-12 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

VIII/B.09-14* Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

VIII/B.09-14 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

VIII/B.09-17 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m

VIII/B.09-20 Yeatmanite Mn9Zn6Sb2Si4O28 P1 1

VIII/B.09-30 Katoptrite (Mn,Mg)13(Al,Fe)4Sb2Si2O28 C 2/m 2/m

Other Katoptrite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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Katoptrite

(Mn,Mg)13(Al,Fe+++)4Sb+++++2Si2O28
Dana No: 44.3.5.1 Strunz No: VIII/B.09-30
Locality:

Notes: