Marialite Mineral Data

Marialite Mineral Data +

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General Marialite Information

Chemical Formula:

Na4Al3Si9O24Cl

Composition:

Molecular Weight = 845.11 gm

Sodium 10.88 % Na 14.67 % Na₂O

Aluminum 9.58 % Al 18.10 % Al₂O₃

Silicon 29.91 % Si 63.99 % SiO₂

Chlorine 4.20 % Cl 4.20 % Cl

- % Cl -0.95 % -O=Cl₂

Oxygen 45.44 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄Al₃Si₉O₂₄Cl

Environment:

Basaltic tuff.

IMA Status:

Valid Species (Pre-IMA) 1866

Locality:

Pianura. Near Naples, Italy. Link to MinDat.org Location Data.

Name Origin:

Named by von Rath in honor of his wife, Maria Rosa vom Rath (1830-1888).

Synonym:

ICSD 39963

PDF 31-1279

Wernerite

Marialite Image

Images:

Marialite

Comments: Fully terminated 4.3 cm crystal of marialite. Weakly fluorescent red under SW UV light.
Location: Gooderham, Haliburton Co., Ontario, Canada. Scale: 6 x 1.5 cm.
© John Veevaert

Marialite Crystallography

Axial Ratios:

a:c = 1:0.62244

Cell Dimensions:

a = 12.075, c = 7.516, Z = 2; V = 1,095.88 Den(Calc)= 2.56

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4/m

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

By Intensity(I/I_o): 3.03(1), 3.44(1), 3.78(0.9),

Forms:

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Forms: [ 1 0 0] [ 3 1 1] [ 1 1 1] [ 1 1 0]

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Crystal Structure:

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Papike J J , Zoltai T , American Mineralogist , 50 (1965) p.641-655, The crystal structure of a marialite scapolite

View Additional jPOWD Structure files for Marialite
[1] [2] [3] [4]

Physical Properties of Marialite

Cleavage:

[100] Distinct, [110] Distinct

Color:

Bluish, Brownish, Colorless, Violet, Greenish.

Density:

2.5 - 2.62, Average = 2.56

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Marialite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2102,KPDmeas= 0.2102,KC= 0.2117

Optical Data:

Uniaxial (-), e=1.537, w=1.539, bire=0.0020.

Calculated Properties of Marialite

Electron Density:

r_electron=2.53 gm/cc
note: r_Marialite=2.56 gm/cc.

Fermion Index

Fermion Index = 0.01418
Boson Index = 0.98582

Photoelectric:

PE_Marialite= 1.87 barns/electron
U=PE_Marialite x r_electron= 4.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Marialite is Not Radioactive

Marialite Classification

Dana Class:

76.3.1.1 (76)Tectosilicate Al-Si Framework

(76.3)with other Be/Al/Si frameworks

(76.3.1)Scapolite group

76.3.1.0 Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 4₁/n 4/m

76.3.1.1 Marialite Na4Al3Si9O24Cl I 4/m 4/m

76.3.1.2 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

76.3.1.3 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

Strunz Class:

VIII/J.13-10 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.13 - Sodalite group, Marialite - Kalborsite series

VIII/J.13-10 Marialite Na4Al3Si9O24Cl I 4/m 4/m

VIII/J.13-20 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

VIII/J.13-25 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

VIII/J.13-30 Sarcolite NaCa6Al4Si6O24F(?) I 4/m 4/m

VIII/J.13-40 Kalborsite K6Al4Si6BO20(OH)4Cl P 42m 4 2m

Other Marialite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Marialite

Na4Al3Si9O24Cl
Dana No: 76.3.1.1 Strunz No: VIII/J.13-10
Locality:

Notes: