Magnesioastrophyllite Mineral Data
General Magnesioastrophyllite 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 % K2 O
Sodium 3.61 % Na 4.86 % Na2 O
Magnesium 3.81 % Mg 6.32 % MgO
Titanium 7.51 % Ti 12.53 % TiO2
Manganese 2.15 % Mn 3.10 % Mn2 O3
Iron 19.71 % Fe 16.90 % FeO / 9.39 % Fe2 O3
Silicon 17.62 % Si 37.70 % SiO2
Hydrogen 0.32 % H 2.83 % H2 O
Oxygen 37.64 % O
Fluorine 1.49 % F 1.49 % F
- %
F -0.63 % -O=F2
______ ______
100.00 % 101.88 % = TOTAL OXIDE
Empirical Formula:
K2 Na2 Mg2 Fe3+ 1.5 Fe2+ 3 Mn3+ 0.5 Ti2 Si8 O26 (OH)4 F
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.
Synonym:
Magnesium astrophyllite - Renamed to Magnesioastrophyllite by Mineralogical Record, v39 (2008), p131
Magnesioastrophyllite Image
Images:
Magnesioastrophyllite 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 - Prismatic H-M Symbol (2/m) Space Group: A2/m
X Ray Diffraction:
By Intensity(I/Io ): 3.38(1), 2.548(0.9), 10.1(0.8),
Physical Properties of Magnesioastrophyllite
Cleavage:
{100} Perfect, {010} Perfect
Color:
Brownish yellow, Green, Straw yellow.
Density:
3.32
Diaphaneity:
Translucent to Opaque
Hardness:
3 - Calcite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Magnesioastrophyllite
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
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 Magnesioastrophyllite
Electron Density:
Bulk Density (Electron Density)=3.24 gm/cc note: Specific Gravity of Magnesioastrophyllite =3.32 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEMagnesioastrophyllite = 9.10 barns/electronU=PEMagnesioastrophyllite x r electron = 29.49 barns/cc.
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
Dana Class:
69.01.01.07 (69) Inosilicate Chains with Side Branches or Loops
(69.01) with (P=2, and N=4, 2 branches)
(69.01.01) Astrophyllite group
69.01.01.01 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1
69.01.01.02 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m
69.01.01.03 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1
69.01.01.04 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri
69.01.01.05 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1
69.01.01.06 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1
69.01.01.07 Magnesioastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m
69.01.01.08 Niobokupletskite ! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1
69.01.01.09 Nalivkinite ! Li2NaFe7Ti2Si8O24(OH)4F P1 1
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
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
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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Magnesioastrophyllite
K2Na[Na(Fe++,Fe+++,Mn)Mg2]Ti2Si8O26(OH)4F
Dana No: 69.01.01.07 Strunz No: 09.DC.05
Locality:
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