Mineralogy Database

Sursassite Mineral Data

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General Sursassite Information

Help on Chemical  Formula: Chemical Formula: Mn++2Al3(SiO4)(Si2O7)(OH)3
Help on Composition: Composition: Molecular Weight = 502.09 gm
   Manganese  21.88 %  Mn   28.26 % MnO
   Aluminum   16.12 %  Al   30.46 % Al2O3
   Silicon    16.78 %  Si   35.90 % SiO2
   Hydrogen    0.60 %  H     5.38 % H2O
   Oxygen     44.61 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+2Al3(SiO4)(Si2O7)(OH)3
Help on Environment: Environment: As vein fillings in manganese deposits in low-grade metasediments.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA)
Help on Locality: Locality: Val d'Err, Oberhalbstein, Graub´┐Żunden, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Roman name for Oberhalbstein, Sursass, Switzerland.
Help on Name Pronunciation: Name Pronunciation: Sursassite + Pronunciation Say SURSASSITE
Help on Synonym: Synonym: ICSD 40031
  PDF 37-479

Sursassite Image

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Comments: Coppery-red colored silky fibrous sursassite vein with white quartz in rock.
Location: Strategic Manganese Mine, near Woodstock, New Brunswick, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sursassite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5025:1:1.5164
Help on Cell Dimensions: Cell Dimensions: a = 8.7, b = 5.79, c = 8.78, Z = 2; beta = 108.9° V = 418.43 Den(Calc)= 3.98
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): 2.82(1), 2.57(0.7), 2.88(0.7),

Physical Properties of Sursassite

Help on Cleavage: Cleavage: {101} Distinct
Help on Color: Color: Deep reddish brown, Copper red.
Help on Density: Density: 3.256
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellowish brown

Optical Properties of Sursassite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.107 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KPDmeas= 0.2311,KC= 0.2117
Ncalc = 1.69 - 1.84
Help on Optical Data: Optical Data: Biaxial (-), a=1.736, b=1.755, g=1.766, bire=0.0300, 2V(Calc)=72, 2V(Meas)=medium.
Help on Pleochroism (x): Pleochroism (x): light yellow.
Help on Pleochroism (y): Pleochroism (y): reddish brown.
Help on Pleochroism (z): Pleochroism (z): light yellow.

Calculated Properties of Sursassite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Sursassite =3.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080517972
Boson Index = 0.9919482028
Help on Photoelectric: Photoelectric: PESursassite = 6.66 barns/electron
U=PESursassite x rElectron Density= 21.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sursassite is Not Radioactive

Sursassite Classification

Help on  Dana Class: Dana Class: (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.03)Sursassite and related species Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 21/m 2/m Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 09.BG.15 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
09.BG.15 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 21/m 2/m
09.BG.15 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 21/m 2/m

Other Sursassite 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 Sursassite :
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.BG.15





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