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Varennesite Mineral Data

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General Varennesite Information

Help on Chemical  Formula: Chemical Formula: Na8Mn++2Si10O25(OH,Cl)2•12(H2O)
Help on Composition: Composition: Molecular Weight = 1,234.05 gm
   Sodium     14.90 %  Na   20.09 % Na2O
   Manganese   8.90 %  Mn   11.50 % MnO
   Silicon    22.76 %  Si   48.69 % SiO2
   Hydrogen    2.08 %  H    18.61 % H2O
   Chlorine    1.44 %  Cl    1.44 % Cl
                -   %   Cl   -0.32 % -O=Cl2   
   Oxygen     49.91 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na8Mn2+2Si10O25(OH)1.5Cl0.5•12(H2O)
Help on Environment: Environment: As a primary, late-stage mineral in a sill.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: Demix-Varennes quarry, which lies between the villages of Varennes and Saint-Amable, in Vercheres County, Quebec Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the locality.
Help on Name Pronunciation: Name Pronunciation: Varennesite + Pronunciation Say VARENNESITE
Help on Synonym: Synonym: ICSD 81583
  PDF 49-1860

Varennesite Image

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Comments: Brown to tan varennesite crystal embedded in nepheline-syenite rock.
Location: DeMix Quarry, Varennes, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Varennesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8951:1:1.1716
Help on Cell Dimensions: Cell Dimensions: a = 13.447, b = 15.022, c = 17.601, Z = 4; V = 3,555.42 Den(Calc)= 2.31
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.049(1), 2.718(0.5), 8.823(0.5),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 0 1) ( 1 0 0)

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Physical Properties of Varennesite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Pale brownish yellow, Orange.
Help on Density: Density: 2.31
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Varennesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2341,KPDmeas= 0.2341,KC= 0.2299
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (+), a=1.532, b=1.54, g=1.55, bire=0.0180, 2V(Calc)=86, 2V(Meas)=89. Dispersion weak, r < v.
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): yellowish green.

Calculated Properties of Varennesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.32 gm/cc
note: Specific Gravity of Varennesite =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEVarennesite = 3.44 barns/electron
U=PEVarennesite x rElectron Density= 7.99 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Varennesite is Not Radioactive

Varennesite Classification

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.05)with corrugated and complex layers
  (72.05.05)Dana Group Varennesite Na8Mn2Si10O25(OH,Cl)2•12(H2O) C mcm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EE.50 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.50 Varennesite Na8Mn2Si10O25(OH,Cl)2•12(H2O) C mcm 2/m 2/m 2/m

Other Varennesite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p767,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Varennesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.EE.50





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