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Magnesioastrophyllite Mineral Data

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General Magnesioastrophyllite Information

Help on Chemical  Formula: Chemical Formula: K2Na[Na(Fe++,Fe+++,Mn)Mg2]Ti2Si8O26(OH)4F
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2Na2Mg2Fe3+1.5Fe2+3Mn3+0.5Ti2Si8O26(OH)4F
Help on Environment: Environment: In a differentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: From Mts. Kukisvumchorr and Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the magnesium content and relationship to astrophyllite.
Help on Synonym: Synonym: Magnesium astrophyllite - Renamed to Magnesioastrophyllite by Mineralogical Record, v39 (2008), p131

Magnesioastrophyllite Image

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Comments: White chalky mass of magnesioastrophyllite in matrix.
Location: N'orkpakhk Mt., Khibiny Massif, Kola Peninsula, Russia. Scale: Specimen Size 35 x 25 x 10 mm.
© Sergey Vasiliev / Systematic Mineralogy

Magnesioastrophyllite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4534:1:0.2326
Help on Cell Dimensions: Cell Dimensions: a = 10.43, b = 23, c = 5.35, Z = 2; beta = 102° V = 1,255.37 Den(Calc)= 3.37
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.38(1), 2.548(0.9), 10.1(0.8),

Physical Properties of Magnesioastrophyllite

Help on Cleavage: Cleavage: {100} Perfect, {010} Perfect
Help on Color: Color: Brownish yellow, Green, Straw yellow.
Help on Density: Density: 3.32
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Magnesioastrophyllite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.158 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.17 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2033,KPDmeas= 0.2063,KC= 0.245
Ncalc = 1.81 - 1.83
Help on Optical Data: Optical Data: Biaxial (-), a=1.658, b=1.687, g=1.71, bire=0.0520, 2V(Calc)=82, 2V(Meas)=81.5-83.
Help on Pleochroism (x): Pleochroism (x): bright yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellowish gray.
Help on Pleochroism (z): Pleochroism (z): gray.

Calculated Properties of Magnesioastrophyllite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Magnesioastrophyllite =3.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMagnesioastrophyllite = 9.10 barns/electron
U=PEMagnesioastrophyllite x relectron= 29.49 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 86.39 (Gamma Ray American Petroleum Institute Units)
Concentration of Magnesioastrophyllite per GRapi unit = 1.16 (%)

Estimated Radioactivity from Magnesioastrophyllite - barely detectable


Magnesioastrophyllite Classification

Help on  Dana Class: Dana Class: (69)Inosilicate Chains with Side Branches or Loops
  (69.01)with (P=2, and N=4, 2 branches)
  (69.01.01)Astrophyllite group Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1 Magnesioastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m Niobokupletskite! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1 Nalivkinite! Li2NaFe7Ti2Si8O24(OH)4F P1 1
Help on  Strunz Class: Strunz Class: 09.DC.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DC -Inosilicates with branched 2-periodic single chains Si2O6 + 2SiO3 � Si4O12
09.DC.05 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1
09.DC.05 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1
09.DC.05 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m
09.DC.05 Magnesioastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m
09.DC.05 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1
09.DC.05 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri
09.DC.05 Nalivkinite! Li2NaFe7Ti2Si8O24(OH)4F P1 1
09.DC.05 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1
09.DC.05 Niobokupletskite! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1

Other Magnesioastrophyllite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Magnesioastrophyllite :
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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Dana No: Strunz No: 09.DC.05





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