Davreuxite Mineral Data

General Davreuxite Information

Chemical Formula:

MnAl6Si4O17(OH)2

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

Empirical Formula:

Mn²⁺Al₆Si₄O₁₇(OH)₂

Environment:

In quartz veins cutting Mn, Al-rich metapelites, derived from shales subjected to low-grade metamorphism.

IMA Status:

Valid Species (Pre-IMA) 1878

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.

Name Origin:

Named for Charles Joseph Davreux (1800-1863), Belgian pharmacist and natural scientist, Professor of Mineralogy at the University of Liµege, Belgium.

Name Pronunciation:

Davreuxite + Pronunciation

Synonym:

ICSD 30870

PDF 37-431

Davreuxite Image

Images:

Davreuxite

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

Davreuxite Crystallography

Axial Ratios:

a:b:c =1.6559:1:2.0941

Cell Dimensions:

a = 9.55, b = 5.767, c = 12.077, Z = 2; beta = 108.1° V = 632.23 Den(Calc)= 3.34

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.511(1), 2.87(0.6), 3.103(0.45),

Crystal Structure:

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Sahl K , Jones P G , Sheldrick G M , American Mineralogist , 69 (1984) p.783-787, The crystal structure of davreuxite, MnAl6Si4O17(OH)2

Physical Properties of Davreuxite

Cleavage:

{100} Good

Color:

Cream white, Light pink.

Density:

3.15

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Silky

Streak:

white

Optical Properties of Davreuxite

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

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

Electron Density:

Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Davreuxite =3.15 gm/cc.

Fermion Index:

Fermion Index = 0.0084899418
Boson Index = 0.9915100582

Photoelectric:

PE_Davreuxite= 3.60 barns/electron
U=PE_Davreuxite x rElectron Density= 11.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Davreuxite is Not Radioactive

Davreuxite Classification

Dana Class:

58.01.02.01 (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

58.01.02.01 Davreuxite MnAl6Si4O17(OH)2 P 2₁/m 2/m

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Davreuxite Specimen Label here :

Davreuxite

MnAl6Si4O17(OH)2
Dana No: 58.01.02.01 Strunz No: 09.BF.15
Locality:

Notes: