Ganterite Mineral Data

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

Images:

Ganterite

Comments: BSE image of thin-section showing ganterite (G) portion of a larger muscovite (M) grain. The lighter color corresponds to greater heavy element (Ba) contents. AmMin, v92, p703.
Location: Lincoln Hill dumortierite deposit in the Humboldt Range located near Oreana, Pershing County, Nevada. Scale: Picture size 300 µm.
© American 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.

Diaphaneity:

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
Ncalc = 1.63

Optical Data:

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

Calculated Properties of Ganterite

Electron Density:

Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Ganterite =3.12 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

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)
Concentration of Ganterite per GRapi unit = 2.86 (%)

Estimated Radioactivity from Ganterite - barely detectable

Ganterite Classification

Dana Class:

71.02.02c.07 (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.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.15 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

09.EC.15 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

09.EC.15 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

09.EC.15 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

09.EC.15 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

09.EC.15 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

09.EC.15 Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

09.EC.15 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

09.EC.15 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

09.EC.15 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

09.EC.15 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

09.EC.15 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

09.EC.15 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

09.EC.15 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

09.EC.15 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

09.EC.15 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

09.EC.15 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 71.02.02c.07 Strunz No: 09.EC.15
Locality:

Notes: