Ottrelite Mineral Data

General Ottrelite Information

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⁺_0.6Mg_0.5Al_3.9Fe³⁺_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. Name Pronunciation: Ottrelite + Pronunciation  

Ottrelite Image

Images:

Ottrelite Crystallography

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/I_o): 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

Cleavage: {001} Perfect, {110} Indistinct Color: Pistachio green. Density: 3.52 Diaphaneity: 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

Gladstone-Dale: CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2057,KPDmeas= 0.2045,KC= 0.2155
Ncalc = 1.75 - 1.76 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

Electron Density: Bulk Density (Electron Density)=3.45 gm/cc
note: Specific Gravity of Ottrelite =3.50 gm/cc.
Fermion Index: Fermion Index = 0.0097433358
Boson Index = 0.9902566642 Photoelectric: PE_Ottrelite = 6.03 barns/electron
U=PE_Ottrelite x rElectron Density= 20.79 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ottrelite is Not Radioactive  

Ottrelite Classification

Dana Class: 52.03.03.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O   (52.03)with cations in [6] coordination only   (52.03.03)Chloritoid group  

52.03.03.01 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1

 

52.03.03.02 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m

 

52.03.03.03 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m

 

52.03.03.04 Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1

Strunz Class: 09.AF.85 09 - SILICATES (Germanates)   09.A - Nesosilicates   09.AF -Nesosilicates with additional anions;  

09.AF.85 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1

 

09.AF.85 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m

 

09.AF.85 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m

 

Other Ottrelite Information

References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2) See Also: Links to other databases for Ottrelite :
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
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Ask about Ottrelite here :
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