Zeophyllite Mineral Data

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.

Name Pronunciation:

Zeophyllite + Pronunciation

Synonym:

Foshallasite

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 - Rhombohedral H-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),

Physical Properties of Zeophyllite

Cleavage:

{0001} Perfect

Color:

White.

Density:

2.747 - 2.764, Average = 2.75

Diaphaneity:

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
Ncalc = 1.63 - 1.65

Optical Data:

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

Calculated Properties of Zeophyllite

Electron Density:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Zeophyllite =2.68 gm/cc.

Fermion Index:

Fermion Index = 0.007923836
Boson Index = 0.992076164

Photoelectric:

PE_Zeophyllite= 4.36 barns/electron
U=PE_Zeophyllite x rElectron Density= 11.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zeophyllite is Not Radioactive

Zeophyllite Classification

Dana Class:

73.01.04.01 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.01)with double layers

(73.01.04)Dana Group

73.01.04.01 Zeophyllite Ca4Si3O8(OH,F)4•2(H2O) R 3 3

Strunz Class:

09.EE.70 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.70 Zeophyllite Ca4Si3O8(OH,F)4•2(H2O) R 3 3

Other Zeophyllite Information

References:

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

See Also:

Links to other databases for Zeophyllite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Print or Cut-and-Paste your Zeophyllite Specimen Label here :

Zeophyllite

Ca4Si3O8(OH,F)4•2(H2O)
Dana No: 73.01.04.01 Strunz No: 09.EE.70
Locality:

Notes:

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