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Ganterite Mineral Data
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General Ganterite Information
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 Chemical Formula: |
[Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 |
| Composition: |
Molecular Weight = 438.39 gm |
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Potassium 2.50 % K 3.01 % K2O |
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Barium 13.78 % Ba 15.39 % BaO |
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Sodium 1.42 % Na 1.91 % Na2O |
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Magnesium 0.50 % Mg 0.83 % MgO |
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Titanium 0.44 % Ti 0.73 % TiO2 |
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Aluminum 19.20 % Al 36.28 % Al2O3 |
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Iron 0.51 % Fe 0.66 % FeO |
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Silicon 17.43 % Si 37.28 % SiO2 |
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Hydrogen 0.43 % H 3.88 % H2O |
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Oxygen 43.80 % O |
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______ ______ |
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100.00 % 99.96 % = TOTAL OXIDE |
| Empirical Formula: |
Ba0.44K0.28Na0.27Al1.84Mg0.09Fe2+0.04Ti0.04Si2.72Al1.28O10.11(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 |
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Oellacherite |
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Sandbergite |
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Ganterite Image |
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Images:
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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 |
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Images:
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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 |
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Ganterite Crystallography
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| 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 - Prismatic H-M Symbol (2/m) Space Group: C 2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 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), |
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Physical Properties of Ganterite
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| 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 |
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Optical Properties of Ganterite
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| 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 |
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Calculated Properties of Ganterite
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| Electron Density: |
Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Ganterite =3.12 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEGanterite = 58.78 barns/electron
U=PEGanterite x relectron= 177.76 barns/cc.
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| Radioactivity: |
GRapi = 34.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Ganterite per GRapi unit = 2.86 (%)
Estimated Radioactivity from Ganterite  - barely detectable
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Ganterite Classification
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| Dana Class: |
71.02.02c.07 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.02)with 2:1 Layers |
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(71.02.02c)Mica Group (Margarite subgroup) |
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71.02.02c.01 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m |
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71.02.02c.02 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m |
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71.02.02c.03 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m |
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71.02.02c.04 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m |
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71.02.02c.05 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m |
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71.02.02c.06 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m |
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71.02.02c.07 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m |
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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) |
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09.E - Phyllosilicates |
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09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets |
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09.EC.15 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m |
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09.EC.15 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m |
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09.EC.15 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m |
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09.EC.15 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m |
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09.EC.15 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m |
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09.EC.15 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m |
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09.EC.15 Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m |
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09.EC.15 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m |
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09.EC.15 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m |
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09.EC.15 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m |
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09.EC.15 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m |
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09.EC.15 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m |
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09.EC.15 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m |
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09.EC.15 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono |
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09.EC.15 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m |
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09.EC.15 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 |
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09.EC.15 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m |
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Other Ganterite Information
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| 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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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:
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