Zeophyllite Mineral Data

Zeophyllite Mineral Data +

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General Zeophyllite Information

Chemical Formula:

Ca4Si3O8(OH,F)4·2(H2O)

Composition:

Molecular Weight = 556.77 gm

Sodium 0.41 % Na 0.56 % Na₂O

Calcium 30.23 % Ca 42.30 % CaO

Aluminum 0.97 % Al 1.83 % Al₂O₃

Silicon 15.64 % Si 33.45 % SiO₂

Hydrogen 2.24 % H 20.06 % H₂O

Oxygen 43.68 % O

Fluorine 6.82 % F 6.82 % F

- % F -2.87 % -O=F₂

______ ______

100.00 % 102.16 % = TOTAL OXIDE

Empirical Formula:

Ca_4.2Na_0.1Si_3.1Al_0.2O₉F₂·6.2(H₂O)

Environment:

Secondary mineral from hydrothermal alteration of basalt.

IMA Status:

Valid Species (Pre-IMA) 1902

Locality:

Litomerice (Leitmeritz), Brezno and Labem (Gross-Priesen), Radejcin (Radzein), and Teplice (Teplitz), Czech Republic. Link to MinDat.org Location Data.

Name Origin:

From the Greek "to boil" and "a leaf", in allusion to its habit.

Synonym:

ICSD 85124

PDF 35-715

Zeophyllite Image

Images:

Zeophyllite

Comments: Numerous white zeophyllite spheroids on a tan matrix.
Location: Brenk, Eifel, Germany. Scale: 2.5 x 1.5 cm.
© John Veevaert

Zeophyllite Crystallography

Axial Ratios:

a:c = 1:3.90578

Cell Dimensions:

a = 9.34, c = 36.48, Z = 8; V = 2,756.00 Den(Calc)= 2.68

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 12(1), 3.03(0.8), 6.09(0.6),

Crystal Structure:

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Merlino S , Acta Crystallographica, Section B , 28 (1972) p.2726-2732, The crystal structure of zeophyllite, Locality: Radzein, Bohemia, Czech Republic

Physical Properties of Zeophyllite

Cleavage:

[0001] Perfect

Color:

White.

Density:

2.747 - 2.764, Average = 2.75

Diaphaniety:

Translucent to Opaque

Habit:

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

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3 - Calcite

Luster:

Pearly

Streak:

white

Optical Properties of Zeophyllite

Gladstone-Dale:

CI meas= 0.122 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.097 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2118,KPDmeas= 0.206,KC= 0.2347

Optical Data:

Uniaxial (-), e=1.56-1.569, w=1.565-1.577, bire=0.0050-0.0080.

Calculated Properties of Zeophyllite

Electron Density:

r_electron=2.73 gm/cc
note: r_Zeophyllite=2.68 gm/cc.

Fermion Index

Fermion Index = 0.00792
Boson Index = 0.99208

Photoelectric:

PE_Zeophyllite= 4.36 barns/electron
U=PE_Zeophyllite x r_electron= 11.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zeophyllite is Not Radioactive

Zeophyllite Classification

Dana Class:

73.1.4.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.1)with double layers

(73.1.4)Dana Group

73.1.4.1 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3

Strunz Class:

VIII/H.34-50 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.34 - Gyrolite series

VIII/H.34-10 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

VIII/H.34-20 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig

VIII/H.34-25 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

VIII/H.34-28 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1

VIII/H.34-30 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3

VIII/H.34-40 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 6₁ 6

VIII/H.34-45 Tungusite Ca14(OH)8(Si8O20)3Fe9(OH)14 P1 1

VIII/H.34-50 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3

VIII/H.34-70 Armstrongite CaZrSi6O15·3(H2O) C 2 2

Other Zeophyllite Information

References:

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

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Zeophyllite

Ca4Si3O8(OH,F)4·2(H2O)
Dana No: 73.1.4.1 Strunz No: VIII/H.34-50
Locality:

Notes: