Sursassite Mineral Data

Sursassite Mineral Data +

General Sursassite Information

Chemical Formula:

Mn++2Al3(SiO4)(Si2O7)(OH)3

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

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

PDF 37-479

Sursassite Image

Images:

Sursassite

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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]

Physical Properties of Sursassite

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

Optical Properties of Sursassite

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.

Calculated Properties of Sursassite

Electron Density:

r_electron=3.19 gm/cc
note: r_Sursassite=3.26 gm/cc.

Fermion Index

Fermion Index = 0.00805
Boson Index = 0.99195

Photoelectric:

PE_Sursassite= 6.66 barns/electron
U=PE_Sursassite x r_electron= 21.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sursassite is Not Radioactive

Sursassite Classification

Dana Class:

58.2.3.1 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.2.3)Sursassite and related species

58.2.3.1 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

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

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.24 - Pumpellyite group

VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-80 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 2₁/c 2/m

Other Sursassite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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: