Ganophyllite Mineral Data

General Ganophyllite Information

Chemical Formula:

(K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O)

Composition:

Molecular Weight = 1,514.20 gm

Potassium 3.87 % K 4.67 % K₂O

Sodium 0.76 % Na 1.02 % Na₂O

Magnesium 2.41 % Mg 3.99 % MgO

Manganese 21.77 % Mn 28.11 % MnO

Aluminum 5.88 % Al 11.11 % Al₂O₃

Silicon 16.69 % Si 35.71 % SiO₂

Hydrogen 1.60 % H 14.28 % H₂O

Oxygen 47.02 % O

______ ______

100.00 % 98.89 % = TOTAL OXIDE

Empirical Formula:

K_1.5Na_0.5Mn²⁺₆Mg_1.5Si₉Al_3.3O₂₉(OH)₇·8.5(H₂O)

Environment:

Metamorphosed manganese deposit.

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

Harstig mine, Pajsberg, near Persberg, Vermland, Sweden. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "luster" and "leaf" for the high luster on cleavage planes.

Name Pronunciation:

Ganophyllite + Pronunciation

Synonym:

ICSD 64788

PDF 21-359

Ganophyllite Image

Images:

Ganophyllite

Comments: Light brown micaceous ganophyllite with milky quartz.
Location: Gambatesa Mine, Genova, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Ganophyllite

Comments: SEM image of a ganophyllite crystal. (AmMin, 88:1325).
Location: Molinello Mine, Val Graveglia, Italy. Scale: Scale bar 100 µ-m.
© American Mineralogist

Ganophyllite Crystallography

Axial Ratios:

a:b:c =0.6118:1:1.8496

Cell Dimensions:

a = 16.6, b = 27.13, c = 50.18, Z = 10; beta = 93.96° V = 22,545.01 Den(Calc)= 1.12

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 12.5(1), 3.14(0.25), 2.7(0.14),

Crystal Structure:

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Noe D C , Veblen D R , American Mineralogist , 84 (1999) p.1088-1098, Incommensurate modulation and the crystal structure of ganophyllite

Physical Properties of Ganophyllite

Cleavage:

{???} Perfect

Color:

Brownish yellow, Cinnamon brown.

Density:

2.84

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Foliated - Two dimensional platy forms.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

brownish yellow

Optical Properties of Ganophyllite

Gladstone-Dale:

CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -1.379 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.5241,KPDmeas= 0.2067,KC= 0.2203
Ncalc = 1.25 - 1.63

Optical Data:

Biaxial (-), a=1.537, b=1.611, g=1.613, bire=0.0760

Pleochroism (x):

pale yellow brown.

Pleochroism (y):

dark yellow brown.

Pleochroism (z):

dark yellow brown.

Calculated Properties of Ganophyllite

Electron Density:

Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Ganophyllite =2.84 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Ganophyllite= 6.74 barns/electron
U=PE_Ganophyllite x r_electron= 18.98 barns/cc.

Radioactivity:

GRapi = 55.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Ganophyllite per GRapi unit = 1.80 (%)

Estimated Radioactivity from Ganophyllite - barely detectable

Ganophyllite Classification

Dana Class:

74.01.02.01 (74)Phyllosilicate Modulated Layers

(74.01)with joined islands

(74.01.02)Ganophyllite group

74.01.02.01 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O) A2/a 2/m

74.01.02.02 Eggletonite Na2Mn8[Si11AlO29](OH)7•11(H2O) Ia or I2/a Mono

74.01.02.03 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112•21(H2O) P 2₁/a 2/m

Strunz Class:

09.EG.30 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.30 Eggletonite Na2Mn8[Si11AlO29](OH)7•11(H2O) Ia or I2/a Mono

09.EG.30 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O) A2/a 2/m

09.EG.30 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112•21(H2O) P 2₁/a 2/m

Other Ganophyllite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Ganophyllite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - Franklin Minerals(Palache)
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - WWW-MINCRYST

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Ask about Ganophyllite here :
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Print or Cut-and-Paste your Ganophyllite Specimen Label here :

Ganophyllite

(K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O)
Dana No: 74.01.02.01 Strunz No: 09.EG.30
Locality:

Notes: