Aliettite Mineral Data

Aliettite Mineral Data +

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General Aliettite Information

Chemical Formula:

[Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe++)2-3(Si,Al)4O10(OH)2·n(H2O)

Composition:

Molecular Weight = 823.18 gm

Sodium 0.56 % Na 0.75 % Na₂O

Calcium 0.49 % Ca 0.68 % CaO

Magnesium 10.33 % Mg 17.14 % MgO

Aluminum 13.11 % Al 24.77 % Al₂O₃

Iron 4.75 % Fe 6.11 % FeO

Silicon 17.06 % Si 36.50 % SiO₂

Hydrogen 1.22 % H 10.94 % H₂O

Oxygen 52.48 % O

______ ______

100.00 % 96.89 % = TOTAL OXIDE

Empirical Formula:

Mg₃Si₄O₁₀(OH)₂Ca_0.1Na_0.2AlFe²⁺_0.7Mg_0.5Al₃SiO₁₀(OH)₂·3(H₂O)

Environment:

Low temperature environments in ancient lake sediments. Also found in low-grade Mg-rich metamorphic rocks.

IMA Status:

Approved IMA 1969

Locality:

Italy, Monte Chiaro, Taro valley. Amargosa desert region, Death Valley, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Andrea Alietti (1923-), clay mineralogist.

Aliettite Image

Images:

Aliettite

Comments: Tan to brownish pseudomorph of aliettite after wollastonite.
Location: Ingichka, Uzbekistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aliettite Crystallography

Axial Ratios:

a:b = 1:4.71625

Cell Dimensions:

a = 5.216, b = 24.6, Z = 1; V = 669.28 Den(Calc)= 2.04

Crystal System:

MonoclinicSpace Group: Unk

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

By Intensity(I/I_o): 12(1), 1.52(0.9), 2.62(0.9),1.314(0.7), 3.5(0.6), 4.54(0.6), 1.725(0.4), 24(0.2),

Physical Properties of Aliettite

Cleavage:

[???] Perfect

Color:

White, Dark green, Buff.

Diaphaniety:

Translucent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Aliettite

Gladstone-Dale:

CI calc= -0.292 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2752,KC= 0.213

Optical Data:

Uniaxial (?), a=1.556, b=1.567, bire=0.0110.

Calculated Properties of Aliettite

Electron Density:

r_electron=2.04 gm/cc
note: r_Aliettite=2.04 gm/cc.

Fermion Index

Fermion Index = 0.01956
Boson Index = 0.98044

Photoelectric:

PE_Aliettite= 2.75 barns/electron
U=PE_Aliettite x r_electron= 5.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aliettite is Not Radioactive

Aliettite Classification

Dana Class:

71.4.2.8 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.4)interlayered 1:1, 2:1, and octahedra

(71.4.2)Interstratified Chlorite-Smectite group

71.4.2.1 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

71.4.2.2 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

71.4.2.3 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

71.4.2.4 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O) Unk Ortho

71.4.2.5 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) Unk Ortho

71.4.2.6 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

71.4.2.7 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O) Unk Mono

71.4.2.8 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2·n(H2O) Unk Mono

71.4.2.9 Glagolevite! NaMg6[Si3AlO10](OH,O)8·H2O C1 1

Strunz Class:

VIII/H.18-20 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.18 - Smectite/Montmorillonite group

VIII/H.18-05 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

VIII/H.18-07 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

VIII/H.18-10 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

VIII/H.18-20 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2·n(H2O) Unk Mono

VIII/H.18-30 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O) Unk Mono

VIII/H.18-50 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O) Unk Ortho

VIII/H.18-60 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) Unk Ortho

VIII/H.18-70 Hydrobiotite [K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2]·[(Mg,Fe,Al)3(Si,Al)4O10(OH)2·4(H2O)] C 2/m 2/m

Other Aliettite Information

References:

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

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Aliettite

[Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe++)2-3(Si,Al)4O10(OH)2·n(H2O)
Dana No: 71.4.2.8 Strunz No: VIII/H.18-20
Locality:

Notes: