Mineralogy Database

Davreuxite Mineral Data

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General Davreuxite Information

Help on Chemical  Formula: Chemical Formula: MnAl6Si4O17(OH)2
Help on Composition: Composition: Molecular Weight = 635.17 gm
   Manganese   8.65 %  Mn   11.17 % MnO
   Aluminum   25.49 %  Al   48.16 % Al2O3
   Silicon    17.69 %  Si   37.84 % SiO2
   Hydrogen    0.32 %  H     2.84 % H2O
   Oxygen     47.86 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Al6Si4O17(OH)2
Help on Environment: Environment: In quartz veins cutting Mn, Al-rich metapelites, derived from shales subjected to low-grade metamorphism.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1878
Help on Locality: Locality: In Belgium, in the Stavelot massif, at Ottr�e, at Sart-Close, near Salmchateau, at Regne, and at Recht. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles Joseph Davreux (1800-1863), Belgian pharmacist and natural scientist, Professor of Mineralogy at the University of Li�ege, Belgium.
Help on Name Pronunciation: Name Pronunciation: Davreuxite + Pronunciation Say DAVREUXITE
Help on Synonym: Synonym: ICSD 30870
  PDF 37-431

Davreuxite Image

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Comments: Pale yellow fibrous davreuxite on quartz.
Location: Ottre, Luxembourg, Belgium. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Davreuxite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6559:1:2.0941
Help on Cell Dimensions: Cell Dimensions: a = 9.55, b = 5.767, c = 12.077, Z = 2; beta = 108.1° V = 632.23 Den(Calc)= 3.34
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.511(1), 2.87(0.6), 3.103(0.45),

Physical Properties of Davreuxite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Cream white, Light pink.
Help on Density: Density: 3.15
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Davreuxite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.203,KPDmeas= 0.2152,KC= 0.21
Ncalc = 1.66 - 1.7
Help on Optical Data: Optical Data: Biaxial (-), a=1.66, b=1.684, g=1.69, bire=0.0300, 2V(Calc)=52, 2V(Meas)=48.

Calculated Properties of Davreuxite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Davreuxite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0084899418
Boson Index = 0.9915100582
Help on Photoelectric: Photoelectric: PEDavreuxite = 3.60 barns/electron
U=PEDavreuxite x rElectron Density= 11.19 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Davreuxite is Not Radioactive

Davreuxite Classification

Help on  Dana Class: Dana Class: (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.01)with cations in [4] and higher coordination; single and double groups (n=1,2)
  (58.01.02)Dana Group Davreuxite MnAl6Si4O17(OH)2 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 09.BF.15 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BF -Sorosilicates with mixed SiO4 and Si2O7 groups;
09.BF.15 Davreuxite MnAl6Si4O17(OH)2 P 21/m 2/m

Other Davreuxite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Davreuxite :
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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Dana No: Strunz No: 09.BF.15





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