Ganophyllite Mineral Data

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.

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

Diaphaniety:

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

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:

r_electron=2.82 gm/cc
note: r_Ganophyllite=2.84 gm/cc.

Fermion Index

Fermion Index = 0.01043
Boson Index = 0.98957

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)

Estimated Radioactivity from Ganophyllite - barely detectable

Ganophyllite Classification

Dana Class:

74.1.2.1 (74)Phyllosilicate Modulated Layers

(74.1)with joined islands

(74.1.2)Ganophyllite group

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

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

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

Strunz Class:

VIII/H.17-60 VIII - Silicates

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

VIII/H.17 - Stilpnomelane series

VIII/H.17-10 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O) A2/a 2/m

VIII/H.17-20 Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16·4-12(H2O) Mono

VIII/H.17-30 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216·16(H2O) Unk (pseudo-HEX) Tri

VIII/H.17-40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27·n(H2O) P1 1

VIII/H.17-45 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O) pseudo-HEX P1 or P1 Tri

VIII/H.17-50 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8·2(H2O)(?) C 2/m 2/m

VIII/H.17-60 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O) A2/a 2/m

VIII/H.17-70 Eggletonite Na2Mn8[Si11AlO29](OH)7·11(H2O) Ia or I2/a Mono

VIII/H.17-75 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112·21(H2O) P 2₁/a 2/m

VIII/H.17-80 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2·2(H2O) Unk Ortho

Other Ganophyllite Information

References:

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

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Ganophyllite

(K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O)
Dana No: 74.1.2.1 Strunz No: VIII/H.17-60
Locality:

Notes: