Yeelimite Mineral Data

Yeelimite Mineral Data

General Yeelimite Information

Chemical Formula:

Ca4Al6O12(SO4)

Composition:

Molecular Weight = 610.26 gm

Calcium 26.27 % Ca 36.76 % CaO

Aluminum 26.53 % Al 50.12 % Al₂O₃

Sulfur 5.25 % S 13.12 % SO₃

Oxygen 41.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Al₆(SO₄)O₁₂

Environment:

From the Hatrurim formation in cobbles in a pseudoconglomerate. High temperature metamorphism of calcareous rocks.

IMA Status:

Approved IMA 1983

Locality:

Hatrurim basin, W of the Dead Sea, Israel, near Har Ye'elim and Nahal Ye'elim (a hill and a wadi). Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 28480

PDF 33-256

Ye'elimite

Yeelimite Image

Images:

Yeelimite Hydroxylellestadite

Comments: Ye'elimite and hydroxylellestadite intimately intergrown as a brownish aggregate in massive anhydrite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Yeelimite Crystallography

Cell Dimensions:

a = 18.392, Z = 16; V = 6,221.38 Den(Calc)= 2.61

Crystal System:

Isometric - GyroidalH-M Symbol (4 3 2) Space Group: I 4₁32

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

By Intensity(I/I_o): 3.7542(1), 2.909(0.15), 3.915(0.1),

Crystal Structure:

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Saalfeld H , Depmeier W , Kristall und Technik , 7 (1972) p.229-233, Silicon-free compounds with sodalite structure, Note: Very short S-O bondlength of 1.26 angstroms, Locality: synthetic

Physical Properties of Yeelimite

Color:

Colorless.

Diaphaniety:

Transparent

Streak:

white

Optical Properties of Yeelimite

Gladstone-Dale:

CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2176,KC= 0.2042

Optical Data:

Isotropic, n=1.568.

Calculated Properties of Yeelimite

Electron Density:

r_electron=2.58 gm/cc
note: r_Yeelimite=2.61 gm/cc.

Fermion Index

Fermion Index = 0.00095
Boson Index = 0.99905

Photoelectric:

PE_Yeelimite= 4.33 barns/electron
U=PE_Yeelimite x r_electron= 11.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yeelimite is Not Radioactive

Yeelimite Classification

Dana Class:

30.1.15.1 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.1)where (A B)m (XO4)p Zq where m:p>2:1

(30.1.15)Dana Group

30.1.15.1 Yeelimite Ca4Al6O12(SO4) I 4₁32 4 3 2

Strunz Class:

VI/B.04-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. cations of medium size

VI/B.04 - D`ansite - Schwerdtmannite series

VI/B.04-10 Dansite Na21Mg(SO4)10Cl3 I 43m 4 3m

VI/B.04-20 Yeelimite Ca4Al6O12(SO4) I 4₁32 4 3 2

VI/B.04-30 Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m

Other Yeelimite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Yeelimite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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

Yeelimite

Ca4Al6O12(SO4)
Dana No: 30.1.15.1 Strunz No: VI/B.04-20
Locality:

Notes: