Nontronite Mineral Data

Nontronite Mineral Data +

General Nontronite Information

Chemical Formula:

Na0.3Fe+++2(Si,Al)4O10(OH)2·n(H2O)

Composition:

Molecular Weight = 495.90 gm

Sodium 1.39 % Na 1.87 % Na₂O

Aluminum 5.44 % Al 10.28 % Al₂O₃

Iron 22.52 % Fe 32.20 % Fe₂O₃

Silicon 16.99 % Si 36.35 % SiO₂

Hydrogen 2.03 % H 18.16 % H₂O

Oxygen 51.62 % O

______ ______

100.00 % 98.87 % = TOTAL OXIDE

Empirical Formula:

Na_0.3Fe³⁺₂Si₃AlO₁₀(OH)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1827

Locality:

Nontrone, Dordogne, France. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

Chloropal

ICSD 86916

Nontronite Image

Images:

Nontronite

Comments: Green massive nontronite in quartz.
Location: Horni Slavkov, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nontronite Crystallography

Axial Ratios:

a:b:c =0.574:1:1.6739

Cell Dimensions:

a = 5.23, b = 9.11, c = 15.25, Z = 2; beta = 96° V = 722.61 Den(Calc)= 2.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 1.52(1), 4.56(1), 15.4(1),

Crystal Structure:

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Manceau A , Chateigner D , Gates W P , Physics and Chemistry of Minerals , 25 (1998) p.347-365, Polarized EXAFS, distance-valence least-squares modelling (DVLS),, and quantitative texture analysis approaches to the structural, refinement of Garfield nontronite

Physical Properties of Nontronite

Cleavage:

[001] Perfect

Color:

Greenish yellow, Brownish green, Olive green.

Density:

2.3

Diaphaniety:

Subopaque

Fracture:

Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

None.

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Nontronite

Gladstone-Dale:

CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2523,KPDmeas= 0.2501,KC= 0.2636

Optical Data:

Biaxial (-), a=1.53-1.58, b=1.555-1.612, g=1.56-1.615, bire=0.0300-0.0350, 2V(Calc)=32-46, 2V(Meas)=5-66. Dispersion r > v strong.

Pleochroism (x):

yellowish green or yellowish green.

Pleochroism (y):

olive green or brownish green.

Pleochroism (z):

olive green or brownish green.

Calculated Properties of Nontronite

Electron Density:

r_electron=2.28 gm/cc
note: r_Nontronite=2.28 gm/cc.

Fermion Index

Fermion Index = 0.01296
Boson Index = 0.98704

Photoelectric:

PE_Nontronite= 7.45 barns/electron
U=PE_Nontronite x r_electron= 17.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nontronite is Not Radioactive

Nontronite Classification

Dana Class:

71.3.1a.3 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.3)with 2:1 clays

(71.3.1a)Smectite group (Dioctahedral Smectites)

71.3.1a.1 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2·n(H2O) C 2/m or ORTH 2/m

71.3.1a.2 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O) C 2/m 2/m

71.3.1a.3 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2·n(H2O) C 2/m 2/m

71.3.1a.4 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1a.5 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2·2(H2O) C 2/m (MON or ORTH) 2/m

Strunz Class:

VIII/H.19-40 VIII - Silicates

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

VIII/H.19 - Brammallite ? - Yakhontovite series

VIII/H.19-10 Brammallite* (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/c 2/m

VIII/H.19-10a Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4·3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m

VIII/H.19-15 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m

VIII/H.19-20 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O) C 2/m 2/m

VIII/H.19-30 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2·n(H2O) C 2/m or ORTH 2/m

VIII/H.19-40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2·n(H2O) C 2/m 2/m

VIII/H.19-50 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.19-60 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2·2(H2O) C 2/m (MON or ORTH) 2/m

VIII/H.19-70 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2·3(H2O) C 2/m 2/m

Other Nontronite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Nontronite

Na0.3Fe+++2(Si,Al)4O10(OH)2·n(H2O)
Dana No: 71.3.1a.3 Strunz No: VIII/H.19-40
Locality:

Notes: