Ottrelite Mineral Data + 
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- 52.3.3.1 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1
- 52.3.3.2 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m
- 52.3.3.3 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m
- 52.3.3.4 Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1
- VIII/B.24-10 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m
- VIII/B.24-20 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1
- VIII/B.24-30 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m
General Ottrelite Information |
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 Chemical Formula: |
(Mn,Fe++,Mg)2Al4Si2O10(OH)4 | ||
| Composition: |
Molecular Weight = 490.11 gm | ||
| Magnesium 2.48 % Mg 4.11 % MgO | |||
| Manganese 10.09 % Mn 13.03 % MnO | |||
| Aluminum 21.47 % Al 40.57 % Al2O3 | |||
| Iron 7.98 % Fe 8.80 % FeO / 1.63 % Fe2O3 | |||
| Silicon 11.46 % Si 24.52 % SiO2 | |||
| Hydrogen 0.82 % H 7.35 % H2O | |||
| Oxygen 45.70 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mn2+0.9Fe2+0.6Mg0.5Al3.9Fe3+0.1Si2O10(OH)4 | ||
| Environment: |
Formed under non-shearing stress conditions in veins and cavities within low- to medium-grade metamorphic rocks. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1819 | ||
| Locality: |
In Belgium, in the Ardennes Mountains, from Ottre, Salmchateau, and Veilsalm. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
Ottrelite Image | |||
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Images:
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Ottrelite Crystallography |
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| Axial Ratios: |
a:b:c =1.7332:1:3.3212 | ||
| Cell Dimensions: |
a = 9.505, b = 5.484, c = 18.214, Z = 4; beta = 101.767° V = 929.46 Den(Calc)= 3.50 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 4.46(1), 2.973(0.8), 2.686(0.45),1.585(0.4), 2.439(0.4), 2.461(0.25), 2.375(0.2), | ||
Physical Properties of Ottrelite |
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| Cleavage: |
[001] Perfect, [110] Indistinct | ||
| Color: |
Pistachio green. | ||
| Density: |
3.52 | ||
| Diaphaniety: |
Translucent | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Scaly - Morphology like fish scales. | ||
| Hardness: |
6-7 - Orthoclase-Quartz | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
greenish gray | ||
Optical Properties of Ottrelite |
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| Optical Data: |
Biaxial (+), a=1.709-1.725, b=1.712-1.726, g=1.716-1.732, bire=0.0070, 2V(Calc)=46-82, 2V(Meas)=46-70. Dispersion r > v strong. | ||
| Pleochroism (x): |
olive yellow. | ||
| Pleochroism (y): |
pale greenish yellow. | ||
| Pleochroism (z): |
very light yellow. | ||
Calculated Properties of Ottrelite |
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| Electron Density: |
relectron=3.45 gm/cc |
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| Fermion Index |
Fermion Index = 0.00974 Boson Index = 0.99026 |
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| Photoelectric: |
PEOttrelite = 6.03 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ottrelite is Not Radioactive |
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Ottrelite Classification |
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| Dana Class: |
52.3.3.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O | ||
| (52.3)with cations in [6] coordination only | |||
| (52.3.3)Chloritoid group | |||
| Strunz Class: |
VIII/B.24-30 VIII - Silicates | ||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12] | |||
| VIII/B.24 - Magnesiochloritoid - Ottrelite series | |||
Other Ottrelite Information |
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2) | ||
| See Also: |
Links to other databases for Ottrelite : 1 -Am. Min. Crystal Structure Database 2 - Applied Mineralogy 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 -École des Mines de Paris Search for Ottrelite using: Visit our Advertisers for Ottrelite : Translate Ottrelite Mineral Data : Ask about Ottrelite here : Print or Cut-and-Paste your Ottrelite Specimen Label here :
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