Tvedalite Mineral Data

Tvedalite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About


Dan Weinrich Auctions
[Mineral Auctions] [Register] [Current Auctions] [Log In] [www.danweinrich.com]
Weinrich Minerals Auctions, Inc
Specializing In Live Weekly Auctions Of Top Quality Mineral Specimens
The Place To Find Great Specimens At Great Prices!


General Tvedalite Information

Help on Chemical Formula: Chemical Formula: (Ca,Mn++)4Be3Si6O17(OH)4•3(H2O)
Help on Composition: Composition: Molecular Weight = 764.79 gm
   Calcium    15.72 %  Ca   22.00 % CaO
   Manganese   7.18 %  Mn    9.28 % MnO
   Beryllium   3.54 %  Be    9.81 % BeO
   Silicon    22.03 %  Si   47.14 % SiO2
   Hydrogen    1.32 %  H    11.78 % H2O
   Oxygen     50.21 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Mn2+Be3Si6O17(OH)4•3(H2O)
Help on Environment: Environment: In vugs in a nepheline-syenite pegmatite. Always overgrown by a crust of chiavennite.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Vevja larvikite quarry, Tvedalen, Brunlanes, Vestfold Co., Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the type locality.
Help on Name Pronunciation: Name Pronunciation: Tvedalite + Pronunciation Say TVEDALITE
Help on Synonym: Synonym: IMA1990-027
 

Search for Tvedalite Images

Click Here To Search Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.
  

Tvedalite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.377:1:0.2127
Help on Cell Dimensions: Cell Dimensions: a = 8.724, b = 23.14, c = 4.923, Z = 2; V = 993.82 Den(Calc)= 2.56
Help on Crystal System: Crystal System: OrthorhombicSpace Group: C face centered
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.837(1), 11.6(0.93), 3.87(0.75),
 

Physical Properties of Tvedalite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: White, Pale gray, Beige.
Help on Density: Density: 2.541
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Tvedalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2359,KPDmeas= 0.2377,KC= 0.2261
Ncalc = 1.57 - 1.58
Help on Optical Data: Optical Data: Biaxial (?), b=1.604
 

Calculated Properties of Tvedalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Tvedalite =2.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PETvedalite = 4.61 barns/electron
U=PETvedalite x rElectron Density= 11.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tvedalite is Not Radioactive
 

Tvedalite Classification
Help on Dana Class: Dana Class: 70.05.02.01 (70)Inosilicate Column or Tube Structures
  (70.05)with chains linked by Be
  (70.05.02)Dana Group
 
70.05.02.01 Tvedalite (Ca,Mn)4Be3Si6O17(OH)4•3(H2O) C face centered Ortho
Help on Strunz Class: Strunz Class: 09.DF.20 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DF -Inosilicates with 2-periodic multiple chains
 
09.DF.20 Tvedalite (Ca,Mn)4Be3Si6O17(OH)4•3(H2O) C face centered Ortho
 

Other Tvedalite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.77,p438-443,1992) OPTIC PROP.(Am.Min.,Vol.77,p438-443,1992)
Help on See Also: See Also: Links to other databases for Tvedalite :
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

Search for Tvedalite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [bing] [GeoScienceWorld] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Tvedalite :

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

John Betts Fine Minerals

Lapis Mineral Journal

Mineral News

UV Tools

Wrights Rock Shop

Translate Tvedalite Mineral Data :

Ask about Tvedalite 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 Espaņol

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

Tvedalite

(Ca,Mn++)4Be3Si6O17(OH)4•3(H2O)
Dana No: 70.05.02.01 Strunz No: 09.DF.20
Locality:

 

Notes: