Astrophyllite Mineral Data + Say ASTROPHYLLITE

General Astrophyllite Information
Help on Chemical Formula: Chemical Formula: K2Na(Fe++,Mn)7Ti2Si8O26(OH)4
Help on Composition: Composition: Molecular Weight = 1,289.00 gm
   Potassium   6.07 %  K     7.31 % K2O
   Sodium      1.78 %  Na    2.40 % Na2O
   Magnesium   1.41 %  Mg    2.35 % MgO
   Titanium    7.43 %  Ti   12.39 % TiO2
   Manganese   4.26 %  Mn    5.50 % MnO
   Iron       22.75 %  Fe   29.26 % FeO
   Silicon    17.43 %  Si   37.29 % SiO2
   Hydrogen    0.27 %  H     2.45 % H2O
   Oxygen     37.86 %  O
   Fluorine    0.74 %  F     0.74 % F
                -   %  F    -0.31 % -O=F2
             ______        ______ 
             100.00 %       99.38 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2NaFe2+5.25Mn2+Mg0.75Ti2Si8O27(OH)3.5F0.5
Help on Environment: Environment: Mineral in zircon-bearing syenites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1854
Help on Locality: Locality: Langesundfiord, near Brevik, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek aster - "star" and fyllon - "leaf."
Help on Synonym: Synonym: ICSD 24911
  PDF 41-1490
 

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Astrophyllite

Comments: Dark brown acicular masses of astrophyllite in calcite matrix.
Location: Khibini, Kola Peninsula, Russia. Scale: 11 x 9 cm.
© Fabre Minerals

Astrophyllite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4614:1:1.0211
Help on Cell Dimensions: Cell Dimensions: a = 5.359, b = 11.614, c = 11.86, Z = 1; alpha = 113.16°, beta = 103.04°, gamma = 94.56° V = 659.08 Den(Calc)= 3.25
Help on Crystal System: Crystal System: Triclinic - PedialH-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.6(1), 3.51(0.8), 2.77(0.6),
Click Here for Large Astrophyllite Structure Window Crystal Structure:

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Piilonen P C , McDonald A M , Lalonde A E , The Canadian Mineralogist , 41 (2003) p.27-54, Insights into astrophyllite-group minerals II: Crystal chemistry, Note: sample LAB3, peralkaline nepheline gneiss, Locality: Seal Lake, Labrador, Canada

View Additional jPOWD Structure files for Astrophyllite
[1] [2] [3] [4] [5] [6]
 

Physical Properties of Astrophyllite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Brown, Brownish red, Bronze yellow, Gold yellow.
Help on Density: Density: 3.3 - 3.4, Average = 3.34
Help on Diaphaniety: Diaphaniety: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Adamantine - Pearly
Help on Streak: Streak: yellowish brown
 

Optical Properties of Astrophyllite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.064 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2164,KPDmeas= 0.21,KC= 0.2244
Help on Optical Data: Optical Data: Biaxial (+), a=1.68, b=1.7, g=1.73, bire=0.0500, 2V(Calc)=80, 2V(Meas)=70-90. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Astrophyllite

Help on Electron Density: Electron Density:

relectron=3.16 gm/cc
note: rAstrophyllite =3.25 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.02417
Boson Index = 0.97583
Help on Photoelectric: Photoelectric:

PEAstrophyllite = 10.45 barns/electron
U=PEAstrophyllite x relectron= 33.07 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 85.21 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Astrophyllite - barely detectable

 

Astrophyllite Classification
Help on Dana Class: Dana Class: 69.1.1.1 (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
Help on Strunz Class: Strunz Class: VIII/G.12-40 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 Astrophyllite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(AmMin, vol 87, p 999) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Astrophyllite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - EUROmin Project 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 -QUT Mineral Atlas 17 - WWW-MINCRYST 18 -École des Mines de Paris

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Astrophyllite

K2Na(Fe++,Mn)7Ti2Si8O26(OH)4
Dana No: 69.1.1.1 Strunz No: VIII/G.12-40
Locality:

 

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