Jasmundite Mineral Data

Jasmundite Mineral Data +

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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

IMA Status:

Approved IMA 1981

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 63412

PDF 33-296

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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 - ScalenohedralH-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

Optical Data:

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

Calculated Properties of Jasmundite

Electron Density:

r_electron=3.03 gm/cc
note: r_Jasmundite=3.03 gm/cc.

Fermion Index

Fermion Index = 0.00712
Boson Index = 0.99288

Photoelectric:

PE_Jasmundite= 6.86 barns/electron
U=PE_Jasmundite x r_electron= 20.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jasmundite is Not Radioactive

Jasmundite Classification

Dana Class:

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

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

(52.4.7)Afwillite and related species

52.4.7.1 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

52.4.7.2 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

52.4.7.3 Hatrurite Ca3SiO5 R 3m 3m

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

Strunz Class:

VIII/B.05-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.05 - Jasmundite series

VIII/B.05-05 Rondorfite! Ca8Mg(SiO4)4Cl2 F d3 2/m 3

VIII/B.05-10 Jasmundite Ca11(SiO4)4O2S I 42m 4 2m

Other Jasmundite Information

References:

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

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Print or Cut-and-Paste your Jasmundite Specimen Label here :

Jasmundite

Ca11(SiO4)4O2S
Dana No: 52.4.7.4 Strunz No: VIII/B.05-10
Locality:

Notes: