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Katoptrite

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Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb25+(SiO4)2O20
System:
Monoclinic
Colour:
black; fire-red (thin ...
Hardness:
Name:
From the Greek κάτοπτρου for "mirror" in allusion to the glassy reflections off its cleavages.
This page provides mineralogical data about Katoptrite.

Classification of Katoptrite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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http://www.mindat.org/min-2169.html
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Type Occurrence of Katoptrite

Year of Discovery:
1917
Geological Setting of Type Material:
Metamorphosed limestone.
Associated Minerals at Type Locality:

Physical Properties of Katoptrite

Metallic
Diaphaneity (Transparency):
Opaque
Comment:
Lustre brilliant
Colour:
black; fire-red (thin sections); red in transmitted light
Streak:
red brown
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {001}, perfect, micaceous.
Density:
4.56 g/cm3 (Measured)    4.65 g/cm3 (Calculated)

Crystallography of Katoptrite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 5.617Å, b = 23.02Å, c = 9.079Å
β = 101.38°
Ratio:
a:b:c = 0.244 : 1 : 0.394
Unit Cell Volume:
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.

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.
Surface Relief:
Very High
Dispersion:
r > v strong
Pleochroism:
Strong
Comments:
Red-brown to orange.
Comments:
2V small.

Chemical Properties of Katoptrite

Formula:
(Mn2+,Mg)13(Al,Fe3+)4Sb25+(SiO4)2O20
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Ca,H2O

Relationship of Katoptrite to other Species

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2O
9.AE.10EuclaseBeAl(SiO4)(OH)
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)
9.AE.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2
9.AE.30ClinohedriteCaZn(SiO4) · H2O
9.AE.35StringhamiteCaCu(SiO4) · H2O
9.AE.45YeatmaniteZn6Mn92+Sb25+(SiO4)4O12
9.AE.50SphaerobertranditeBe3(SiO4)(OH)2
17.7.1SuzukiiteBaVSi2O7
17.7.2FranciscaniteMn62+(V5+,☐)2(SiO4)2(O,OH)6
17.7.3Kurumsakite(Zn,Ni,Cu)8Al8V25+Si5O35 · 27H2O (?)
17.7.4Ardennite-(As)Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6
17.7.5Medaite(Mn,Ca)6(V,As)Si5O18OH
17.7.6JohninnesiteNa2Mn92+Mg7(OH)8[AsO4]2[Si6O17]2
17.7.7TiragalloiteMn42+(HAsSi3O13)
17.7.8DixeniteCuMn142+Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6
17.7.9AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
17.7.10McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
17.7.11KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16
17.7.12Schallerite(Mn,Fe)16Si12As3O36(OH)17
17.7.13Nelenite(Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3]
17.7.14KoliciteMn72+Zn4(AsO4)2(SiO4)2(OH)8
17.7.15YeatmaniteZn6Mn92+Sb25+(SiO4)4O12
17.7.16WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]
17.7.18ParweliteMn10Sb2As2Si2O24
17.7.19Långbanite(Mn2+,Ca)4(Mn3+,Fe3+)9Sb5+(SiO4)2O16
17.7.20ChapmaniteFe23+Sb3+(Si2O5)O3(OH)
17.7.21Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)

Other Names for Katoptrite

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.

References for Katoptrite

Reference List:
Igelström (1885) Bulletin de la Société française de Minéralogie: 8: 143 (as Hematostibite).

Flink (1917) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 39: 426.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 206.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1027 (as Hematostibite), 1029-1030 (as Catoptrite).

American Mineralogist (1966): 51: 1484.

American Mineralogist (1977): 62: 396.

127: 47-61.

Moore, P.B. (1966) Catoptrite [katoptrite] and yeatmanite { stuffed pyrochroite structures? American Mineralogist: 51: 1494-1500.

Moore, P.B., T. Araki, and G.D. Brunton (1976) Catoptrite [katoptrite], (Mn2+5 Sb5+2)VI(Mn2+8Al4Si2)IVO28; a novel
close-packed oxide sheet structure. Neues Jahrbuch für Mineralogie, Abhandlungen: 127, 47-61.

Internet Links for Katoptrite

Localities for Katoptrite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Sweden
 
  • Värmland
    • Filipstad
Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183. ; K:Gatedal
      • Nordmark district
        • Jakobsberg ore field
MinMag 62, 395; Kjell Gatedal
Nysten, P. (1987). Armangite from Nordmark. GFF, 109(2), 110-110.
Geologiska Föreningens i Stockholm. Förhandlingar, Stockholm (1917): 39: 431; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 787, 1030; Mineralogical Magazine (1978): 42, 133-136; Kjell Gatedal.
Nysten, P. (1994): Alabandit och synadelfit, Nordmark. Långbansnytt. vol 10. [reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 43]; Nysten, P. (1987). Armangite from Nordmark. GFF, 109(2), 110-110.
Mineralogical Magazine (1998) 62 (3), 395-407
  • Västmanland
    • Hällefors
      • Grythyttan
Igelström (1885) Bulletin de la Société française de Minéralogie: 8: 143 (as Hematostibite).; Igelström, L.J. (1886): Polyarsenit och hæmatostibiit. Geologiska Föreningen i Stockholm Förhandlingar 8: 179-181; Moore, P. B. (1972). III. On Igelström's Manganese Arsenates and Antimonates from the Sjö Mine, Grythyttan, Örebro County, Sweden. GFF, 94(3), 423-434.
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