Hydroastrophyllite Mineral Data

Hydroastrophyllite Mineral Data

General Hydroastrophyllite Information

Chemical Formula:

(H3O,K)2Ca(Fe+++,Mn)5-6Ti2Si8O26(OH)4F

Composition:

Molecular Weight = 1,213.30 gm

Potassium 1.61 % K 1.94 % K₂O

Calcium 3.30 % Ca 4.62 % CaO

Titanium 5.52 % Ti 9.22 % TiO₂

Manganese 8.15 % Mn 7.60 % MnO / 3.25 % Mn₂O₃

Niobium 3.06 % Nb 4.38 % Nb₂O₅

Aluminum 2.22 % Al 4.20 % Al₂O₃

Iron 16.11 % Fe 23.03 % Fe₂O₃

Silicon 16.20 % Si 34.66 % SiO₂

Hydrogen 0.71 % H 6.31 % H₂O

Oxygen 41.54 % O

Fluorine 1.57 % F 1.57 % F

- % F -0.66 % -O=F₂

______ ______

100.00 % 100.13 % = TOTAL OXIDE

Empirical Formula:

(H₃O)_1.5K_0.5CaFe³⁺_3.5Mn²⁺_1.3Mn³⁺_0.5Ti_1.4Nb_0.4Si₇AlO₂₆(OH)₄F

Environment:

Weathering product in an alkalic pegmatite.

IMA Status:

Approved IMA 1974

Locality:

Undefined locality in Sichuan Province, China. Link to MinDat.org Location Data.

Name Origin:

Named for its high water content and relationship to astrophyllite.

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Hydroastrophyllite Crystallography

Axial Ratios:

a:b:c =0.9899:1:0.4524

Cell Dimensions:

a = 11.86, b = 11.98, c = 5.42, Z = 1; alpha = 103.42°, beta = 95.15°, gamma = 112.2° V = 690.73 Den(Calc)= 2.92

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.51(1), 10.55(0.9), 2.643(0.8),

Physical Properties of Hydroastrophyllite

Cleavage:

[???] Good, [???] Good

Color:

Dark brown.

Density:

3.15

Diaphaniety:

Translucent to Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Adamantine

Streak:

yellow white

Optical Properties of Hydroastrophyllite

Optical Data:

Biaxial (-), a=1.66, b=1.72, g=1.728, bire=0.0680, 2V(Calc)=38, 2V(Meas)=40.

Pleochroism (x):

bright yellow.

Pleochroism (y):

orange yellow.

Pleochroism (z):

dull yellow.

Calculated Properties of Hydroastrophyllite

Electron Density:

r_electron=2.86 gm/cc
note: r_{Hydroastrophyllite}=2.92 gm/cc.

Fermion Index

Fermion Index = 0.01837
Boson Index = 0.98163

Photoelectric:

PE_{Hydroastrophyllite}= 13.49 barns/electron
U=PE_{Hydroastrophyllite} x r_electron= 38.50 barns/cc.

Radioactivity:

GRapi = 22.72 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Hydroastrophyllite - barely detectable

Hydroastrophyllite Classification

Dana Class:

69.1.1.6 (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.12-30 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 Hydroastrophyllite Information

References:

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

See Also:

Links to other databases for Hydroastrophyllite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Hydroastrophyllite

(H3O,K)2Ca(Fe+++,Mn)5-6Ti2Si8O26(OH)4F
Dana No: 69.1.1.6 Strunz No: VIII/G.12-30
Locality:

Notes: