Zircophyllite Mineral Data

Zircophyllite Mineral Data +

General Zircophyllite Information

Chemical Formula:

K2(Na,Ca)(Mn,Fe++)7(Zr,Nb)2Si8O26(OH)4F

Composition:

Molecular Weight = 1,423.34 gm

Potassium 4.67 % K 5.63 % K₂O

Sodium 1.13 % Na 1.52 % Na₂O

Calcium 0.56 % Ca 0.79 % CaO

Zirconium 10.25 % Zr 13.85 % ZrO₂

Titanium 1.35 % Ti 2.24 % TiO₂

Manganese 14.67 % Mn 18.94 % MnO

Niobium 1.96 % Nb 2.80 % Nb₂O₅

Iron 14.13 % Fe 18.17 % FeO

Silicon 15.00 % Si 32.08 % SiO₂

Hydrogen 0.35 % H 3.16 % H₂O

Oxygen 34.73 % O

Fluorine 1.20 % F 1.20 % F

- % F -0.51 % -O=F₂

______ ______

100.00 % 99.89 % = TOTAL OXIDE

Empirical Formula:

K_1.7Na_0.7Ca_0.2Fe²⁺_3.6Mn²⁺_3.8Zr_1.6Nb_0.3Ti_0.4Si_7.6O_26.8(OH)_3.2F_0.9·0.9(H₂O)

Environment:

In the natrolite zone of alkalic pegmatites.

IMA Status:

Approved IMA 1972

Locality:

Korgeredabinsh massif, Tuva, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the ZIRCOnium in the composition and the Greek for "leaf," in reference to the habit.

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Zircophyllite Crystallography

Crystal System:

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

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

By Intensity(I/I_o): 3.5(1), 2.8(0.7), 2.66(0.5),

Physical Properties of Zircophyllite

Cleavage:

[001] Perfect

Color:

Dark brown, Black, Black brown.

Density:

3.34

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Streak:

light brown

Optical Properties of Zircophyllite

Gladstone-Dale:

CI meas= -0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2189,KC= 0.2107

Optical Data:

Biaxial (-), a=1.708, b=1.738, g=1.747, bire=0.0390, 2V(Calc)=56, 2V(Meas)=62.

Pleochroism (x):

dark yellow.

Pleochroism (y):

dark yellow.

Pleochroism (z):

brown.

Calculated Properties of Zircophyllite

Electron Density:

r_electron=3.21 gm/cc
note: r_{Zircophyllite}=3.34 gm/cc.

Fermion Index

Fermion Index = 0.02342
Boson Index = 0.97658

Photoelectric:

PE_{Zircophyllite}= 26.01 barns/electron
U=PE_{Zircophyllite} x r_electron= 83.55 barns/cc.

Radioactivity:

GRapi = 64.80 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Zircophyllite - barely detectable

Zircophyllite Classification

Dana Class:

69.1.1.5 (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.12-70 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 Zircophyllite Information

References:

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

See Also:

Links to other databases for Zircophyllite :
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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Zircophyllite

K2(Na,Ca)(Mn,Fe++)7(Zr,Nb)2Si8O26(OH)4F
Dana No: 69.1.1.5 Strunz No: VIII/G.12-70
Locality:

Notes: