Anandite Mineral Data

Anandite Mineral Data +

General Anandite Information

Chemical Formula:

(Ba,K)(Fe++,Mg)3(Si,Al,Fe)4O10(S,OH)2

Composition:

Molecular Weight = 593.15 gm

Potassium 1.65 % K 1.99 % K₂O

Barium 17.36 % Ba 19.39 % BaO

Magnesium 3.07 % Mg 5.10 % MgO

Aluminum 3.18 % Al 6.02 % Al₂O₃

Iron 24.01 % Fe 27.25 % FeO / 4.04 % Fe₂O₃

Silicon 14.20 % Si 30.39 % SiO₂

Hydrogen 0.08 % H 0.76 % H₂O

Sulfur 8.11 % S 8.11 % S^2-

- % S -4.05 % -O=S

Oxygen 28.32 % O

______ ______

100.00 % 98.99 % = TOTAL OXIDE

Empirical Formula:

Ba_0.75K_0.25Fe²⁺_2.25Mg_0.75Si₃Al_0.7Fe³⁺_0.3O₁₀S_1.5(OH)_0.5

Environment:

Found in banded iron ores.

IMA Status:

Approved IMA 1967

Locality:

Wilagedera prospect, North Western Province, Sri Lanka. Link to MinDat.org Location Data.

Name Origin:

Named for Ananda Kentish Coomaraswamy (1877-1947), first director of the Mineral Survey of Ceylon (Sri Lanka).

Anandite Image

Images:

Anandite Gillespite

Comments: Black micaceous anandite with dark red gillespite.
Location: Esquire No. 7 Claim, Big Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Anandite Crystallography

Axial Ratios:

a:b:c =0.5736:1:2.115

Cell Dimensions:

a = 5.412, b = 9.434, c = 19.953, Z = 4; beta = 94.87° V = 1,015.06 Den(Calc)= 3.88

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): 3.32(1), 4.99(0.9), 2.49(0.8),2.72(0.5), 2.68(0.4), 1.66(0.3), 1.991(0.3),

Crystal Structure:

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Filut M A , Rule A C , Bailey S W , American Mineralogist , 70 (1985) p.1298-1308, Crystal structure refinement of anandite-2Or, a barium-, and sulfur-bearing trioctahedral mica

Physical Properties of Anandite

Cleavage:

[001] Perfect

Color:

Black.

Density:

3.94

Diaphaniety:

Subtranslucent to opaque

Fracture:

Flexible - Flexible fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

gray white

Optical Properties of Anandite

Optical Data:

Biaxial (+), a=1.855, g=1.88, bire=0.0250, 2V(Meas)=0.

Pleochroism (x):

green.

Pleochroism (y):

green.

Pleochroism (z):

brown.

Calculated Properties of Anandite

Electron Density:

r_electron=3.68 gm/cc
note: r_Anandite=3.88 gm/cc.

Fermion Index

Fermion Index = 0.04648
Boson Index = 0.95352

Photoelectric:

PE_Anandite= 81.99 barns/electron
U=PE_Anandite x r_electron= 302.10 barns/cc.

Radioactivity:

GRapi = 22.57 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Anandite - barely detectable

Anandite Classification

Dana Class:

71.2.2c.4 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2c)Mica Group (Margarite subgroup)

71.2.2c.1 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2c.2 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

71.2.2c.3 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

71.2.2c.4 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

71.2.2c.5 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

71.2.2c.6 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

71.2.2c.7 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

71.2.2c.8 IMA2004-013! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m

Strunz Class:

VIII/H.12-10 VIII - Silicates

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

VIII/H.12 - Mica group, Lepidolite series

VIII/H.12-10 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

VIII/H.12-20 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

VIII/H.12-30 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

VIII/H.12-35 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

VIII/H.12-40 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.12-50 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

VIII/H.12-60 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

Other Anandite Information

References:

NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Dana8)

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Anandite

(Ba,K)(Fe++,Mg)3(Si,Al,Fe)4O10(S,OH)2
Dana No: 71.2.2c.4 Strunz No: VIII/H.12-10
Locality:

Notes: