Jasmundite Mineral Data

General Jasmundite Information

Chemical Formula:

Ca11(SiO4)4O2S

Composition:

Molecular Weight = 873.26 gm

Calcium 50.48 % Ca 70.64 % CaO

Silicon 12.86 % Si 27.52 % SiO₂

Sulfur 3.67 % S 3.67 % S^2-

- % S -1.83 % -O=S

Oxygen 32.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₁₁(SiO₄)₄O₂S

Environment:

In metamorphosed limestone inclusions in basalt.

IMA Status:

Approved IMA 1981

Locality:

Bellerberg volcano, two km north of Mayen, Eifel district, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Karl Jasmund, retired Director of the Mineralogical-Petrographic Institute, University of Cologne, Cologne, Germany.

Name Pronunciation:

Jasmundite + Pronunciation

Synonym:

ICSD 63412

PDF 33-296

Jasmundite Image

Images:

Jasmundite Cuspidine

Comments: Tan-brownish crystals of jasmundite and dark green cuspidine with gehlenite and spinel in matrix.
Location: Bellerberg, Eifel, Germany. Scale: Not Given.
© Diederik Visser

Jasmundite Crystallography

Axial Ratios:

a:c = 1:0.84246

Cell Dimensions:

a = 10.461, c = 8.813, Z = 2; V = 964.43 Den(Calc)= 3.01

Crystal System:

Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42m

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

By Intensity(I/I_o): 2.832(1), 3.242(0.42), 2.615(0.35),

Physical Properties of Jasmundite

Cleavage:

None

Color:

Brownish green, Greenish brown, Dark brown.

Density:

3.03

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

5 - Apatite

Luster:

Resinous

Streak:

white

Optical Properties of Jasmundite

Gladstone-Dale:

CI meas= -0.158 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.166 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2397,KPDmeas= 0.2381,KC= 0.2056
Ncalc = 1.62

Optical Data:

Uniaxial (+), w=1.715, e=1.728, bire=0.0130.

Calculated Properties of Jasmundite

Electron Density:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Jasmundite =3.03 gm/cc.

Fermion Index:

Fermion Index = 0.0071230718
Boson Index = 0.9928769282

Photoelectric:

PE_Jasmundite= 6.86 barns/electron
U=PE_Jasmundite x rElectron Density= 20.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jasmundite is Not Radioactive

Jasmundite Classification

Dana Class:

52.04.07.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.07)Afwillite and related species

52.04.07.01 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

52.04.07.02 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

52.04.07.03 Hatrurite Ca3SiO5 R 3m 3m

52.04.07.04 Jasmundite Ca11(SiO4)4O2S I 42m 4 2m

Strunz Class:

09.AG.70 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ï¿½ [6] coordination

09.AG.70 Jasmundite Ca11(SiO4)4O2S I 42m 4 2m

Other Jasmundite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Jasmundite :
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
15 - WWW-MINCRYST

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Jasmundite

Ca11(SiO4)4O2S
Dana No: 52.04.07.04 Strunz No: 09.AG.70
Locality:

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