Zeophyllite
A valid IMA mineral species - grandfathered
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About Zeophyllite
Formula:
Ca13Si10O28(OH)2F8 · 6H2O
Colour:
White
Lustre:
Pearly
Hardness:
3
Specific Gravity:
2.747 - 2.764
Crystal System:
Trigonal
Name:
Named after the Greek "ζέω" (zeo), 'to boil', and "φύλλον" (phyllos), 'leaf', alluding to its occurrence in hemispheral foliated forms and intumescence (swelling) on heating.
This page provides mineralogical data about Zeophyllite.
Unique Identifiers
Mindat ID:
4396
Long-form identifier:
mindat:1:1:4396:6
Similar Names
| Xaphyllite | A synonym of Tetradymite |
IMA Classification of Zeophyllite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca13Si10O28(OH)2F8·6H2O
Classification of Zeophyllite
9.EE.70
9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
Dana 7th ed.:
73.1.4.1
73.1.4.1
73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
1 : Condensed Tetrahedral Sheets with double layers
73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
1 : Condensed Tetrahedral Sheets with double layers
17.1.17
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Zp | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Zeophyllite
Pearly
Transparency:
Translucent
Colour:
White
Hardness:
3 on Mohs scale
Cleavage:
Perfect
{0001}
{0001}
Density:
2.747 - 2.764 g/cm3 (Measured) 2.75 g/cm3 (Calculated)
Optical Data of Zeophyllite
Type:
Uniaxial (-)
RI values:
nω = 1.565 - 1.577 nε = 1.560 - 1.569
Max. Birefringence:
δ = 0.005 - 0.008
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Comments:
anomalously biaxial
Chemistry of Zeophyllite
Mindat Formula:
Ca13Si10O28(OH)2F8 · 6H2O
Element Weights:
Common Impurities:
Al,Fe,Mg,Na,K
Crystallography of Zeophyllite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 9.36 Å, c = 34.48 Å
Ratio:
a:c = 1 : 3.684
Unit Cell V:
2,616.07 ų (Calculated from Unit Cell)
Z:
9
Morphology:
(Pseudo-?)hexagonal. As platy crystals in radiating spherical aggregates.
Comment:
Chalmers et al. (1956) give a pseudhexagonal cell with 9.34, 9.34, 13.2 Å, 90, 110, 120°.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014639 | Zeophyllite | Mikenda W, Pertlik F, Povondra P, Ulrych J (1997) On zeophyllite from Radejcin, Ceske stredohori Mts.: X-ray and IR-investigations Mineralogy and Petrology 61 199-209 | 1997 | Alter Berg, Radzein | 0 | 293 | |
| 0009455 | Zeophyllite | Merlino S (1972) The crystal structure of zeophyllite Acta Crystallographica B28 2726-2732 |  | 1972 | Radzein, Bohemia, Czech Republic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.0 Å | (100) |
| 3.03 Å | (80) |
| 6.09 Å | (60) |
| 2.946 Å | (60) |
| 3.71 Å | (50) |
| 2.648 Å | (50) |
| 2.547 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| 10 : Basalt-hosted zeolite minerals | |
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) |
Type Occurrence of Zeophyllite
General Appearance of Type Material:
radiating platy crystals, to 1 cm
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 86427.
Geological Setting of Type Material:
secondary mineral from hydrothermal alteration of basalt
Associated Minerals at Type Locality:
Synonyms of Zeophyllite
Other Language Names for Zeophyllite
Common Associates
Associations Based on Photo Data:
| 14 photos of Zeophyllite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 11 photos of Zeophyllite associated with Apophyllite Group | AB4[Si8O20]X · 8H2O |
| 10 photos of Zeophyllite associated with Phillipsite Subgroup | (Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O |
| 8 photos of Zeophyllite associated with Analcime | Na(AlSi2O6) · H2O |
| 6 photos of Zeophyllite associated with Brenkite | Ca2(CO3)F2 |
| 5 photos of Zeophyllite associated with Calcite | CaCO3 |
| 2 photos of Zeophyllite associated with Tobermorite | Ca5Si6O17 · 5H2O |
| 1 photo of Zeophyllite associated with Phillipsite-K | K6(Si10Al6)O32 · 12H2O |
Related Minerals - Strunz-mindat Grouping
| 9.EE. | Cairncrossite | Sr2Ca7-xNa2x(Si4O10)4(OH)2(H2O)15-x |
| 9.EE.05 | Bementite | Mn7Si6O15(OH)8 |
| 9.EE.07 | Innsbruckite | Mn33(Si2O5)14(OH)38 |
| 9.EE.10 | 'Brokenhillite' | Mn8Si6O15(OH)10 |
| 9.EE.10 | Mcgillite | (Mn,Fe)8Si6O15(OH)8Cl2 |
| 9.EE.10 | Friedelite | Mn2+8Si6O15(OH,Cl)10 |
| 9.EE.10 | Pyrosmalite-(Mn) | Mn2+8Si6O15(OH,Cl)10 |
| 9.EE.10 | Pyrosmalite-(Fe) | Fe2+8Si6O15(OH,Cl)10 |
| 9.EE.15 | Nelenite | Mn2+16As3+3Si12O36(OH)17 |
| 9.EE.15 | Schallerite | Mn2+16As3Si12O36(OH)17 |
| 9.EE.20 | Palygorskite | ◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| 9.EE.20 | Yofortierite | Mn2+Mn2+2Mn2+2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| 9.EE.20 | Windhoekite | Fe3+(Fe3+1.67◻0.33)Ca2◻2Si8O20(OH)2(H2O)4(OH)2 · 6H2O |
| 9.EE.20 | Windmountainite | ◻Fe3+2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| 9.EE.20 | Ikorskyite | KMn3+(Si4O10) · 3H2O |
| 9.EE.20 | Tuperssuatsiaite | Fe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2O |
| 9.EE.20 | 'Unnamed (Na-Ca-Fe-Silicate-Hydrate)' | NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2O |
| 9.EE.25 | Sepiolite | Mg4(Si6O15)(OH)2 · 6H2O |
| 9.EE.25 | Loughlinite | Na2Mg3Si6O16 · 8H2O |
| 9.EE.25 | Falcondoite | (Ni,Mg)4Si6O15(OH)2 · 6H2O |
| 9.EE.25 | Kalifersite | (K,Na)5Fe3+7Si20O50(OH)6 · 12H2O |
| 9.EE.30 | Orlymanite | Ca4Mn3Si8O20(OH)6 · 2H2O |
| 9.EE.30 | Tungusite | Ca4Fe2Si6O15(OH)6 |
| 9.EE.30 | Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| 9.EE.35 | Reyerite | (Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O |
| 9.EE.35 | Kodamaite | Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O |
| 9.EE.35 | Truscottite | (Ca,Mn)14Si24O58(OH)8 · 2H2O |
| 9.EE.40 | Natrosilite | Na2Si2O5 |
| 9.EE.45 | Makatite | Na2Si4O8(OH)2 · 4H2O |
| 9.EE.50 | Varennesite | Na8Mn2Si10O25(OH,Cl)2 · 12H2O |
| 9.EE.55 | Raite | Mn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6 |
| 9.EE.60 | Intersilite | Na6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2O |
| 9.EE.65 | Zakharovite | Na4Mn5Si10O24(OH)6 · 6H2O |
| 9.EE.65 | Shafranovskite | Na3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2O |
| 9.EE.75 | Minehillite | (K,Na)2-3Ca28Zn4Al4Si40O112(OH)16 |
| 9.EE.80 | Fedorite | (Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O |
| 9.EE.80 | Martinite | (Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2 · 4H2O |
| 9.EE.80 | Ellingsenite | Na5Ca6Si18O38(OH)13 · 6H2O |
| 9.EE.85 | Lalondeite | (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Zeophyllite
mindat.org URL:
https://www.mindat.org/min-4396.html
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References for Zeophyllite
Reference List:
Chalmers, R.A., Dent, Lesley S., Taylor, H. F. W. (1958) Zeophyllite. Mineralogical Magazine and Journal of the Mineralogical Society, 31 (240). 726-735 doi:10.1180/minmag.1958.031.240.02
Merlino, S. (1972) The crystal structure of zeophyllite. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 28 (9) 2726-2732 doi:10.1107/s0567740872006855
Passaglia, Elio, Porcelli, Cesare (1983) Zeophyllite from Monte Somma, Vesuvius, Italy. Mineralogical Magazine, 47 (344) 397-400 doi:10.1180/minmag.1983.047.344.19
Localities for Zeophyllite
Showing 25 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria | |
| Postl et al. (1996) +1 other reference |
Canada | |
| Grice (1989) +1 other reference |
Czech Republic | |
| Pauliš et al. (2023) |
| Slavíček (1984) |
| Mikenda +4 other references |
| Pelikan A (1902) |
| Pelikan (1902) | |
Germany | |
| Brauns (1922) |
| Brauns +1 other reference |
| Blaß et al. (1992) +1 other reference |
| Juroszek et al. (Ti 5 Fe) | |
Hungary | |
| Vezzalini |
Italy | |
| Passaglia et al. (1983) |
Japan | |
| Matsuyama (2001) |
| Matsueda (1983) |
Norway | |
| Dietrich et al. (1965) +1 other reference |
| Raade (1972) | |
Romania | |
| Hirtopanu (2006) |
| Szakáll et al. (2010) | |
Russia | |
| A. E. Zadov data |
| Pekov et al. (2004) |
| [World of Stones 95:5-6 |
Sweden | |
| The Swedish Museum of Natural History ... |
USA | |
| Heinrich et al. (2004) |
| Bridge (1966) |
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Ynglingarum, Häglinge, Hässleholm, Skåne County, Sweden