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 % K2 O
Barium 17.36 % Ba 19.39 % BaO
Magnesium 3.07 % Mg 5.10 % MgO
Aluminum 3.18 % Al 6.02 % Al2 O3
Iron 24.01 % Fe 27.25 % FeO / 4.04 % Fe2 O3
Silicon 14.20 % Si 30.39 % SiO2
Hydrogen 0.08 % H 0.76 % H2 O
Sulfur 8.11 % S 8.11 % S2-
- % S -4.05 % -O=S
Oxygen 28.32 % O
______ ______
100.00 % 98.99 % = TOTAL OXIDE
Empirical Formula:
Ba0.75 K0.25 Fe2+ 2.25 Mg0.75 Si3 Al0.7 Fe3+ 0.3 O10 S1.5 (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).
Name Pronunciation:
Anandite
Anandite Image
Images:
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 - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 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),
Physical Properties of Anandite
Cleavage:
{001} Perfect
Color:
Black.
Density:
3.94
Diaphaneity:
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
Gladstone-Dale:
CI meas = -0.216 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.235 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2236,KPDmeas = 0.2202,KC = 0.1811 Ncalc = 1.7 - 1.71
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:
Bulk Density (Electron Density)=3.74 gm/cc note: Specific Gravity of Anandite =3.94 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEAnandite = 81.99 barns/electronU=PEAnandite x r electron = 306.77 barns/cc.
Radioactivity:
GRapi = 22.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Anandite per GRapi unit = 4.43 (%)
Estimated Radioactivity from Anandite - barely detectable
Anandite Classification
Dana Class:
71.02.02c.04 (71) Phyllosilicate Sheets of Six-Membered Rings
(71.02) with 2:1 Layers
(71.02.02c) Mica Group (Margarite subgroup)
71.02.02c.01 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m
71.02.02c.02 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m
71.02.02c.03 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m
71.02.02c.04 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m
71.02.02c.05 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m
71.02.02c.06 Ferrokinoshitalite ! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m
71.02.02c.07 Ganterite ! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m
71.02.02c.08 Oxykinoshitalite ! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m
Strunz Class:
09.EC.35 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.35 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m
09.EC.35 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m
09.EC.35 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m
09.EC.35 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m
09.EC.35 Ferrokinoshitalite ! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m
09.EC.35 Oxykinoshitalite ! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m
Other Anandite Information
References:
NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Dana8)
See Also:
Links to other databases for Anandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Franklin Minerals(Dunn)
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST
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Anandite
(Ba,K)(Fe++,Mg)3(Si,Al,Fe)4O10(S,OH)2
Dana No: 71.02.02c.04 Strunz No: 09.EC.35
Locality:
Notes:
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