Ganterite Mineral Data

Ganterite Mineral Data

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General Ganterite Information

Chemical Formula:

[Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2

Composition:

Molecular Weight = 438.39 gm

Potassium 2.50 % K 3.01 % K₂O

Barium 13.78 % Ba 15.39 % BaO

Sodium 1.42 % Na 1.91 % Na₂O

Magnesium 0.50 % Mg 0.83 % MgO

Titanium 0.44 % Ti 0.73 % TiO₂

Aluminum 19.20 % Al 36.28 % Al₂O₃

Iron 0.51 % Fe 0.66 % FeO

Silicon 17.43 % Si 37.28 % SiO₂

Hydrogen 0.43 % H 3.88 % H₂O

Oxygen 43.80 % O

______ ______

100.00 % 99.96 % = TOTAL OXIDE

Empirical Formula:

Ba_0.44K_0.28Na_0.27Al_1.84Mg_0.09Fe²⁺_0.04Ti_0.04Si_2.72Al_1.28O_10.11(OH)_1.89

Environment:

Rock-forming mica found in bands and lenses of white-mica schist, and in a leucocratic zoisite-celsian gneiss. Ba-dominant muscovite.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Berisal Complex, Simplon, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named for Gantertal Valley region in which the mineral was found.

Synonym:

IMA2000-033

Oellacherite

Sandbergite

Ganterite Image

Images:

Ganterite

Comments: Black and white thin-section micrograph of ganterite in white mica schist (sample SS9787) (S.Gt: synkinematic ganterite; P.Gt: postkinematic ganterite. (CanMin 41:1284).
Location: Metamorphosed basement rocks from the Berisal Complex, Simplon Region, Switzerland. Scale: See Image.
© Canadian Mineralogist

Ganterite Crystallography

Axial Ratios:

a:b:c =0.5768:1:2.2114

Cell Dimensions:

a = 5.2068, b = 9.027, c = 19.963, Z = 4; beta = 95.87° V = 933.38 Den(Calc)= 3.12

Crystal System:

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

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

By Intensity(I/I_o): 2.571(1)(202,131), 2.602(0.95)(130,131), 1.504(0.91)(060,2.0.10),3.737(0.77)(023), 3.887(0.76)(113), 3.495(0.71)(114), 4.481(0.71)(110),

Physical Properties of Ganterite

Cleavage:

[001] Perfect

Color:

Light gray, Silver.

Diaphaniety:

Transparent

Fracture:

Flexible - Flexible fragments.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ganterite

Gladstone-Dale:

CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1967,KC= 0.2008

Optical Data:

Biaxial (-), a=1.6, b=1.619, g=1.622, bire=0.0220

Calculated Properties of Ganterite

Electron Density:

r_electron=3.02 gm/cc
note: r_Ganterite=3.12 gm/cc.

Fermion Index

Fermion Index = 0.03408
Boson Index = 0.96592

Photoelectric:

PE_Ganterite= 58.78 barns/electron
U=PE_Ganterite x r_electron= 177.76 barns/cc.

Radioactivity:

GRapi = 34.94 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Ganterite - barely detectable

Ganterite Classification

Dana Class:

71.2.2c.7 (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.10-95 VIII - Silicates

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

VIII/H.10 - Mica group, Muscovite series

VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

VIII/H.10-80 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

VIII/H.10-95 Ganterite [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

Other Ganterite Information

References:

NAME( CanMin, 41:1971) PHYS. PROP.(CanMin, 41:1971) OPTIC PROP.(CanMin, 41:1971)

See Also:

Links to other databases for Ganterite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Ganterite Specimen Label here :

Ganterite

[Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2
Dana No: 71.2.2c.7 Strunz No: VIII/H.10-95
Locality:

Notes: