Magnesiumastrophyllite Mineral Data

Magnesiumastrophyllite Mineral Data

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General Magnesiumastrophyllite Information

Chemical Formula:

K2Na[Na(Fe++,Fe+++,Mn)Mg2]Ti2Si8O26(OH)4F

Composition:

Molecular Weight = 1,275.02 gm

Potassium 6.13 % K 7.39 % K₂O

Sodium 3.61 % Na 4.86 % Na₂O

Magnesium 3.81 % Mg 6.32 % MgO

Titanium 7.51 % Ti 12.53 % TiO₂

Manganese 2.15 % Mn 3.10 % Mn₂O₃

Iron 19.71 % Fe 16.90 % FeO / 9.39 % Fe₂O₃

Silicon 17.62 % Si 37.70 % SiO₂

Hydrogen 0.32 % H 2.83 % H₂O

Oxygen 37.64 % O

Fluorine 1.49 % F 1.49 % F

- % F -0.63 % -O=F₂

______ ______

100.00 % 101.88 % = TOTAL OXIDE

Empirical Formula:

K₂Na₂Mg₂Fe³⁺_1.5Fe²⁺₃Mn³⁺_0.5Ti₂Si₈O₂₆(OH)₄F

Environment:

In a differentiated alkalic massif.

IMA Status:

Approved IMA 1963

Locality:

From Mts. Kukisvumchorr and Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the magnesium content and relationship to astrophyllite.

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Magnesiumastrophyllite Crystallography

Axial Ratios:

a:b:c =0.4534:1:0.2326

Cell Dimensions:

a = 10.43, b = 23, c = 5.35, Z = 2; beta = 102° V = 1,255.37 Den(Calc)= 3.37

Crystal System:

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

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

By Intensity(I/I_o): 3.38(1), 2.548(0.9), 10.1(0.8),

Physical Properties of Magnesiumastrophyllite

Cleavage:

[100] Perfect, [010] Perfect

Color:

Brownish yellow, Green, Straw yellow.

Density:

3.32

Diaphaniety:

Translucent to Opaque

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Magnesiumastrophyllite

Optical Data:

Biaxial (-), a=1.658, b=1.687, g=1.71, bire=0.0520, 2V(Calc)=82, 2V(Meas)=81.5-83.

Pleochroism (x):

bright yellow.

Pleochroism (y):

pale yellowish gray.

Pleochroism (z):

gray.

Calculated Properties of Magnesiumastrophyllite

Electron Density:

r_electron=3.29 gm/cc
note: r_{Magnesiumastrophyllite}=3.37 gm/cc.

Fermion Index

Fermion Index = 0.02612
Boson Index = 0.97388

Photoelectric:

PE_{Magnesiumastrophyllite}= 9.10 barns/electron
U=PE_{Magnesiumastrophyllite} x r_electron= 29.93 barns/cc.

Radioactivity:

GRapi = 86.39 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Magnesiumastrophyllite - barely detectable

Magnesiumastrophyllite Classification

Dana Class:

69.1.1.7 (69)Inosilicate Chains with Side Branches or Loops

(69.1)with (P=2, and N=4, 2 branches)

(69.1.1)Astrophyllite group

69.1.1.1 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1

69.1.1.2 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m

69.1.1.3 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1

69.1.1.4 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri

69.1.1.5 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1

69.1.1.6 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1

69.1.1.7 Magnesiumastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m

69.1.1.8 Niobokupletskite! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1

Strunz Class:

VIII/G.12-20 VIII - Silicates

VIII/G - Intermediate between chain- and layered silicates

VIII/G.12 - Astrophyllite- Kupletskite group

VIII/G.12-20 Magnesiumastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m

VIII/G.12-30 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1

VIII/G.12-40 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1

VIII/G.12-50 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m

VIII/G.12-60 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1

VIII/G.12-65 Niobokupletskite! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1

VIII/G.12-70 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1

VIII/G.12-80 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri

Other Magnesiumastrophyllite Information

References:

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

See Also:

Links to other databases for Magnesiumastrophyllite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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

Magnesiumastrophyllite

K2Na[Na(Fe++,Fe+++,Mn)Mg2]Ti2Si8O26(OH)4F
Dana No: 69.1.1.7 Strunz No: VIII/G.12-20
Locality:

Notes: