Davreuxite Mineral Data

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Davreuxite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Davreuxite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Davreuxite Mineral Data :

Ask about Davreuxite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: