General Sursassite Information
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Chemical Formula: |
Mn++2Al3(SiO4)(Si2O7)(OH)3 |
Composition: |
Molecular Weight = 502.09 gm |
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Manganese 21.88 % Mn 28.26 % MnO |
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Aluminum 16.12 % Al 30.46 % Al2O3 |
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Silicon 16.78 % Si 35.90 % SiO2 |
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Hydrogen 0.60 % H 5.38 % H2O |
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Oxygen 44.61 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Mn2+2Al3(SiO4)(Si2O7)(OH)3 |
Environment: |
Metamorphosed manganese deposit. |
IMA Status: |
Valid Species (Pre-IMA) |
Locality: |
Val d'Eff, grisons, Switzerland. Link to MinDat.org Location Data. |
Synonym: |
ICSD 40031 |
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PDF 37-479 |
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Sursassite Image |
Images:
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Sursassite Crystallography
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Axial Ratios: |
a:b:c =1.5025:1:1.5164 |
Cell Dimensions: |
a = 8.7, b = 5.79, c = 8.78, Z = 2; beta = 108.9° V = 418.43 Den(Calc)= 3.98 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m |
X Ray Diffraction: |
By Intensity(I/Io): 2.82(1), 2.57(0.7), 2.88(0.7), |
Crystal Structure:
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Gottschalk M , Fockenberg T , Grevel K-D , Wunder B , Wirth R , Schreyer W , Maresch W V , European Journal of Mineralogy , 12 (2000) p.935-945, Crystal structure of the high-pressure phase Mg4(MgAl)Al4[Si6O21/(OH)7]:, an analogue of sursassite, Sample: A53
View Additional jPOWD Structure files for Sursassite
[1]
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Physical Properties of Sursassite
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Cleavage: |
[101] Distinct |
Color: |
Deep reddish brown, Copper red. |
Density: |
3.256 |
Diaphaniety: |
Transparent to translucent |
Habit: |
Botryoidal - "Grape-like" rounded forms (e.g.. malachite). |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Luster: |
Vitreous (Glassy) |
Streak: |
yellowish brown |
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Optical Properties of Sursassite
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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 |
Optical Data: |
Biaxial (-), a=1.736, b=1.755, g=1.766, bire=0.0300, 2V(Calc)=72, 2V(Meas)=medium. |
Pleochroism (x): |
light yellow. |
Pleochroism (y): |
reddish brown. |
Pleochroism (z): |
light yellow. |
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Calculated Properties of Sursassite
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Electron Density: |
relectron=3.19 gm/cc note: rSursassite =3.26 gm/cc. |
Fermion Index |
Fermion Index = 0.00805 Boson Index = 0.99195 |
Photoelectric: |
PESursassite = 6.66 barns/electron U=PESursassite x relectron= 21.24 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Sursassite is Not Radioactive |
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Sursassite Classification
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Dana Class: |
58.2.3.1 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups |
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(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2) |
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(58.2.3)Sursassite and related species |
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58.2.3.1 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 21/m 2/m |
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58.2.3.2 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 21/m 2/m |
Strunz Class: |
VIII/C.24-20 VIII - Silicates |
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VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups |
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VIII/C.24 - Pumpellyite group |
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VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 21/m 2/m |
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VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 21/m 2/m |
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VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m |
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VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m |
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VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m |
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VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m |
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VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m |
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VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m |
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VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m |
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VIII/C.24-80 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono |
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VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m |
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VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 21/c 2/m |
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Other Sursassite Information
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References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Sursassite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Sursassite Specimen Label here :
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Sursassite
Mn++2Al3(SiO4)(Si2O7)(OH)3
Dana No: 58.2.3.1 Strunz No: VIII/C.24-20
Locality:
Notes:
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