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 % S2-
- % S -1.83 % -O=S
Oxygen 32.98 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca11 (SiO4 )4 O2 S
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 4 2m
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEJasmundite = 6.86 barns/electronU=PEJasmundite x r Electron 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 4 2m 4 2m
Strunz Class:
09.AG.70 09 - SILICATES (Germanates)
09.A - Nesosilicates
09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination
09.AG.70 Jasmundite Ca11(SiO4)4O2S I 4 2m 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
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