Katoptrite Mineral Data

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.

Name Pronunciation:

Katoptrite + Pronunciation

Synonym:

Catoptrite

ICSD 121137

PDF 19-274

Katoptrite Image

Images:

Katoptrite

Comments: Red-brown grains of katoptite in matrix.
Location: Jakobsberg, Nordmark, Sweden. Scale: Box Size 4x6 cm.
© Sonke Stolze / Systematic Minerals

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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Forms: ( 1 1 1) ( 0 1 1) ( 1 3 1) ( 0 1 0) ( 1 1 1) ( 1 0 0) ( 1 1 0) ( 0 0 1)

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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

Diaphaneity:

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
Ncalc = 1.86 - 1.88

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:

Bulk Density (Electron Density)=4.25 gm/cc
note: Specific Gravity of Katoptrite =4.56 gm/cc.

Fermion Index:

Fermion Index = 0.004398122
Boson Index = 0.995601878

Photoelectric:

PE_Katoptrite= 63.79 barns/electron
U=PE_Katoptrite x rElectron Density= 271.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Katoptrite is Not Radioactive

Katoptrite Classification

Dana Class:

44.03.05.01 (44)Antimonates

(44.03)with miscellaneous formulae

(44.03.05)Dana Group

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

Strunz Class:

09.AE.40 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AE -Nesosilicates with additional (O,OH,F,H2O);

09.AE.40 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)

See Also:

Links to other databases for Katoptrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Katoptrite here :
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Print or Cut-and-Paste your Katoptrite Specimen Label here :

Katoptrite

(Mn,Mg)13(Al,Fe+++)4Sb+++++2Si2O28
Dana No: 44.03.05.01 Strunz No: 09.AE.40
Locality:

Notes: