General Katophorite Information Chemical Formula: |
Na(CaNa)Fe++4(Al,Fe+++)Si7AlO22(OH)2 |
Composition: |
Molecular Weight = 939.86 gm |
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Potassium 1.25 % K 1.50 % K2O |
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Sodium 2.94 % Na 3.96 % Na2O |
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Calcium 5.54 % Ca 7.76 % CaO |
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Magnesium 3.88 % Mg 6.43 % MgO |
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Titanium 1.02 % Ti 1.70 % TiO2 |
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Manganese 1.17 % Mn 1.51 % MnO |
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Aluminum 2.01 % Al 3.80 % Al2O3 |
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Iron 19.31 % Fe 24.84 % FeO |
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Silicon 21.81 % Si 46.67 % SiO2 |
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Hydrogen 0.21 % H 1.92 % H2O |
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Oxygen 40.86 % O |
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______ ______ |
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100.00 % 100.09 % = TOTAL OXIDE |
Empirical Formula: |
Na1.2K0.3Ca1.3Fe2+3.25Mg1.5Ti0.2Mn2+0.2Al0.7Si7.3O22(OH)2 |
Environment: |
Found in basic alkaline igneous rocks and in blueschist facies jadeitites. Forms a series with magnesiokatophorite. |
IMA Status: |
Valid Species (Pre-IMA) 1894 |
Locality: |
La Tabatiere, PQ, Canada and the Christiania region, Norway. Link to MinDat.org Location Data. |
Name Origin: |
Named from the Greek for "carrying down", in allusion to its volcanic origin. |
Name Pronunciation: |
Katophorite + Pronunciation |
Synonym: |
Aluminokatophorite |
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Catophorite |
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ICSD 64886 |
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PDF 85-1481 |
| | Katophorite Image
Images:
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Katophorite Crystallography Axial Ratios: |
a:b:c =0.5555:1:0.293 |
Cell Dimensions: |
a = 10.019, b = 18.036, c = 5.286, Z = 2; beta = 104.98° V = 922.73 Den(Calc)= 3.38 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
Crystal Structure:
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Mouse
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| Physical Properties of Katophorite Cleavage: |
{110} Perfect, {010} Parting |
Color: |
Black, Dark greenish black, Bluish black, Reddish yellow, Bluish green. |
Density: |
3.2 - 3.5, Average = 3.35 |
Diaphaneity: |
Transparent to Translucent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Epitaxial - Crystallographic alignment with a precursor mineral |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
5 - Apatite |
Luster: |
Vitreous (Glassy) |
| Optical Properties of Katophorite Gladstone-Dale: |
CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.045 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1982,KPDmeas= 0.2,KC= 0.2074 Ncalc = 1.66 - 1.73 Optical Data: |
Biaxial (-), a=1.64-1.681, b=1.658-1.688, g=1.66-1.692, bire=0.0110-0.0200, 2V(Calc)=36-72, 2V(Meas)=0-50. Dispersion r > v. |
| Calculated Properties of Katophorite Electron Density: |
Bulk Density (Electron Density)=3.29 gm/cc |
note: Specific Gravity of Katophorite =3.35 gm/cc. Fermion Index: |
Fermion Index = 0.01 |
Boson Index = 0.99 Photoelectric: |
PEKatophorite = 8.02 barns/electron |
U=PEKatophorite x relectron= 26.42 barns/cc. Radioactivity: |
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GRapi = 17.70 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Katophorite - barely detectable | Katophorite Classification Dana Class: |
66.01.03b.12 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.01)with P=2 amphibole configuration |
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(66.01.03b)Group 3, the sodic-calcic amphiboles |
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Strunz Class: |
09.DE.20 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family |
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| Other Katophorite Information References: |
NAME( Dana8) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Katophorite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - Handbook of Mineralogy (MinSocAm) 7 - Handbook of Mineralogy (UofA) 8 - MinDAT 9 - Mineralienatlas (Deutsch) 10 - Online Mineral Museum 11 - QUT Mineral Atlas 12 - Ruff.Info Search for Katophorite using: Visit our Advertisers for Katophorite : A Bijoux Google Search for KatophoriteAdam's Minerals Google Search for Katophorite Cape Minerals Google Search for Katophorite Dakota Matrix Minerals Google Search for Katophorite Excalibur Mineral Corp. Google Search for Katophorite Exceptional Minerals Google Search for Katophorite John Betts Fine Minerals Search for Katophorite McDougall Minerals Google Search for Katophorite Mineral News Website Link Rock and Mineral Shows Google Search for Katophorite Weinrich Minerals, Inc. Google Search for Katophorite Ask about Katophorite here : Print or Cut-and-Paste your Katophorite Specimen Label here :
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