Wiluite Mineral Data

Wiluite Mineral Data +

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General Wiluite Information

Chemical Formula:

Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10

Composition:

Molecular Weight = 2,924.83 gm

Calcium 26.04 % Ca 36.43 % CaO

Magnesium 3.99 % Mg 6.61 % MgO

Titanium 0.82 % Ti 1.37 % TiO₂

Aluminum 6.46 % Al 12.20 % Al₂O₃

Iron 1.72 % Fe 2.46 % Fe₂O₃

Silicon 17.28 % Si 36.98 % SiO₂

Boron 0.96 % B 3.09 % B₂O₃

Hydrogen 0.07 % H 0.62 % H₂O

Oxygen 42.67 % O

______ ______

100.00 % 99.75 % = TOTAL OXIDE

Empirical Formula:

Ca₁₉Al₇Mg_4.8Fe³⁺_0.9Ti_0.5B_2.6Si₁₈O₇₆(OH)₂

Environment:

Found with grossular and serpentine-group minerals in a serpentinized skarn. Isostructural with vesuvianite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Wilui River, Yakutia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the discovery locality.

Synonym:

IMA1997-026

Wiluite Image

Images:

Wiluite

Comments: Dark green, blocky wiluite crystal.
Location: Wilui River Region, Russia. Scale: 1-1/8" x 1"..
© Chris Wright / Wrights Rock Shop

Wiluite Crystallography

Axial Ratios:

a:c = 1:0.74384

Cell Dimensions:

a = 15.752, c = 11.717, Z = 2; V = 2,907.29 Den(Calc)= 3.34

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nnc

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

By Intensity(I/I_o): 2.776(1), 2.617(0.61), 2.491(0.61),2.592(0.43), 1.66(0.26), 1.64(0.23), 2.121(0.2), 3.52(0.18), 1.987(0.15),

Forms:

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Forms: [ 1 1 0] [ 1 0 1] [ 0 0 1] [ 1 0 0]

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Crystal Structure:

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Bellatreccia F , Camara F , Ottolini L , Della Ventura G , Cibin G , Mottana A , The Canadian Mineralogist , 43 (2005) p.1457-1468, Wiluite from Ariccia, Latium, Italy: Occurrence and crystal structure, Locality: Ariccia, Latium, Italy

Physical Properties of Wiluite

Cleavage:

[100] Poor

Color:

Dark green.

Density:

3.36

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

colorless

Optical Properties of Wiluite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2165,KPDmeas= 0.2152,KC= 0.2137

Optical Data:

Uniaxial (+), w=1.721, e=1.725, bire=0.0040.

Calculated Properties of Wiluite

Electron Density:

r_electron=3.34 gm/cc
note: r_Wiluite=3.36 gm/cc.

Fermion Index

Fermion Index = 0.01595
Boson Index = 0.98405

Photoelectric:

PE_Wiluite= 4.79 barns/electron
U=PE_Wiluite x r_electron= 16.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wiluite is Not Radioactive

Wiluite Classification

Dana Class:

58.2.4.2 (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)

(58.2.4)Vesuvianite Group

58.2.4.1 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m

58.2.4.2 Wiluite ! Ca19(Al,Mg,Fe,Ti)13(B,Al,[])5Si18O68(O,OH)10 P 4/nnc 4/m 2/m 2/m

58.2.4.3 Fluorvesuvianite! Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10 P 4/nnc 4/m 2/m 2/m

58.2.4.4 Manganvesuvianite! Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m

Strunz Class:

VIII/C.26-20 VIII - Silicates

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

VIII/C.26 - Vesuvianite series

VIII/C.26-03 Manganvesuvianite! Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m

VIII/C.26-05 Fluorvesuvianite! Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10 P 4/nnc 4/m 2/m 2/m

VIII/C.26-10 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m

VIII/C.26-20 Wiluite Ca19(Al,Mg,Fe,Ti)13(B,Al,[])5Si18O68(O,OH)10 P 4/nnc 4/m 2/m 2/m

Other Wiluite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(CanMin, 10/98) OPTIC PROP.(CanMin, 10/98)

See Also:

Links to other databases for Wiluite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 - HyperPhysics 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 - Mineral and Gemstone Kingdom 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Wiluite

Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10
Dana No: 58.2.4.2 Strunz No: VIII/C.26-20
Locality:

Notes: