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Cyrilovite
A valid IMA mineral species - grandfathered
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About Cyrilovite
Formula:
NaFe3+3(PO4)2(OH)4 · 2H2O
Colour:
Bright yellow, honey-yellow, orange to brownish yellow, brown
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.081 - 3.096
Crystal System:
Tetragonal
Member of:
Name:
For the type location
Type Locality:
Isostructural with:
Unique Identifiers
Mindat ID:
1206
Long-form identifier:
mindat:1:1:1206:1
IMA Classification of Cyrilovite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaFe3+3(PO4)2(OH)4·2H2O
First published:
1953
Classification of Cyrilovite
8.DL.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
42.7.8.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
19.14.1
19 : Phosphates
14 : Phosphates of Fe and other metals
19 : Phosphates
14 : Phosphates of Fe and other metals
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 |
|---|---|---|
| Cyr | 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 Cyrilovite
Vitreous
Transparency:
Translucent
Colour:
Bright yellow, honey-yellow, orange to brownish yellow, brown
Streak:
Yellow
Hardness:
4 on Mohs scale
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.081 - 3.096 g/cm3 (Measured) 3.114 g/cm3 (Calculated)
Optical Data of Cyrilovite
Type:
Uniaxial (-)
RI values:
nω = 1.802 - 1.805 nε = 1.769 - 1.775
Max. Birefringence:
δ = 0.030 - 0.033
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:
Very High (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.
Pleochroism:
Weak
Comments:
O= deep yellow to yellow
E= colorless to yellow
E= colorless to yellow
Chemistry of Cyrilovite
Mindat Formula:
NaFe3+3(PO4)2(OH)4 · 2H2O
Element Weights:
Crystallography of Cyrilovite
Crystal System:
Tetragonal
Class (H-M):
422 - Trapezohedral
Space Group:
P41212
Cell Parameters:
a = 7.313(2) Å, c = 19.315(3) Å
Ratio:
a:c = 1 : 2.641
Unit Cell V:
1,032.97 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Thick tabular crystals, also pyramidal, pseudo-octahedral, radiating botryoidal aggregates or crusts.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0014614 | Cyrilovite | Cozzupoli D, Grubessi O, Mottana A, Zanazzi P F (1987) Cyrilovite from Italy: structure and crystal chemistry Mineralogy and Petrology 37 1-14 | 1987 | Bosa, Sardinia, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.77 Å | (50) |
| 4.74 Å | (100) |
| 3.12 Å | (60) |
| 3.09 Å | (80) |
| 3.00 Å | (80) |
| 2.83 Å | (40) |
| 2.59 Å | (80) |
| 2.11 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Geological Setting:
Accessory mineral in granitic pegmatites
Type Occurrence of Cyrilovite
General Appearance of Type Material:
Crystalline crusts on frondellite
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 107425.
Geological Setting of Type Material:
Pegmatite
Synonyms of Cyrilovite
Other Language Names for Cyrilovite
Relationship of Cyrilovite to other Species
Member of:
Other Members of Wardite Group:
| Fluorowardite | NaAl3(PO4)2F2(OH)2(H2O)2 | Tet. 422 : P41212 |
| Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O | Tet. |
| Wardite | NaAl3(PO4)2(OH)4 · 2H2O | Tet. 422 : P41212 |
Common Associates
Associations Based on Photo Data:
| 51 photos of Cyrilovite associated with Chalcosiderite | CuFe3+6(PO4)4(OH)8 · 4H2O |
| 50 photos of Cyrilovite associated with Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O |
| 47 photos of Cyrilovite associated with Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 27 photos of Cyrilovite associated with Natrodufrénite | NaFe3+Fe3+5(PO4)4O(OH)5(H2O)2 |
| 20 photos of Cyrilovite associated with Strengite | FePO4 · 2H2O |
| 19 photos of Cyrilovite associated with Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 16 photos of Cyrilovite associated with Saléeite | Mg(UO2)2(PO4)2 · 10H2O |
| 14 photos of Cyrilovite associated with Rockbridgeite | (Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 13 photos of Cyrilovite associated with Meurigite-K | KFe3+8(PO4)6(OH)7 · 6.5H2O |
| 13 photos of Cyrilovite associated with Fluorapatite | Ca5(PO4)3F |
Related Minerals - Strunz-mindat Grouping
| 8.DL.05 | Foggite | CaAl(PO4)(OH)2 · H2O |
| 8.DL.10 | Fluorowardite | NaAl3(PO4)2F2(OH)2(H2O)2 |
| 8.DL.10 | Wardite | NaAl3(PO4)2(OH)4 · 2H2O |
| 8.DL.10 | Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O |
| 8.DL.15 | Petersite-(Ce) | CeCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | 'Agardite-(Dy)' | (Dy,La)Cu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(Y) | YCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Mixite | BiCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(La) | LaCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Goudeyite | AlCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Plumboagardite | PbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.20 | Dugganite | Pb3Zn3(AsO4)2(TeO6) |
| 8.DL.20 | Wallkilldellite | Ca2Mn2+3(AsO4)2(OH)4 · 9H2O |
| 8.DL.20 | Wallkilldellite-(Fe) | (Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2O |
| 8.DL.20 | Cheremnykhite | Pb3Zn3(VO4)2(TeO6) |
| 8.DL.20 | Kuksite | Pb3Zn3(PO4)2(TeO6) |
| 8.DL.25 | Angastonite | CaMgAl2(PO4)2(OH)4 · 7H2O |
| 8.DL.30 | Långbanshyttanite | Pb2Mn2Mg(AsO4)2(OH)4 · 6H2O |
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 Cyrilovite
mindat.org URL:
https://www.mindat.org/min-1206.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Cyrilovite
Reference List:
Lindberg, Marie Louise (1957) Relationship of the minerals avelinoite, cyrilovite and wardite. American Mineralogist, 42 (3-4) 204-213
Fleischer, M. (1957) New mineral names. American Mineralogist, 42 (7-8) 580-586 avelinoite = cyrilovite
Tarte, Pierre, Fransolet, André-Mathieu, Pillard, François (1984) Le spectre infrarouge de la cyrilovite et de la wardite : corrélations entre la structure et la composition chimique. Bulletin de Minéralogie, 107 (6) 745-754 doi:10.3406/bulmi.1984.7816
Cozzupoli, D., Grubessi, O., Mottana, A., Zanazzi, P. F. (1987) Cyrilovite from Italy: Structure and crystal chemistry. Mineralogy and Petrology, 37 (1) 1-14 doi:10.1007/bf01163154
Nathan, Y., Panczer, G., Gross, S. (1988) The thermal analysis of some phosphate minerals: strengite, lipscombite, cyrilovite and goyazite. Thermochimica Acta, 135. 259-266 doi:10.1016/0040-6031(88)87395-7
Localities for Cyrilovite
Showing 78 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.
Argentina | |
| VIII Congreso de Mineralogía y ... +2 other references |
Australia | |
| McLean et al. (2004) |
| Birch et al. (1997) |
| Segnit et al. (1981) +1 other reference |
| Francis (2010) |
| Francis (2010) | |
| Frost et al. (2004) |
| |
| Francis et al. (self published) |
| Brian Beyer via John Toma (IDs at SA Museum?) +1 other reference |
| Elliott et al. (2025) |
| Lottermoser et al. (1997) |
| Pilkington et al. (1979) |
| Mineralogical Society of America - ... |
| Birch et al. (1993) |
| Jo Price Collection |
| P. Sutton (2007) |
| Henry et al. (1988) +1 other reference |
| Peter Downes |
Austria | |
| Walter F. & Ettinger (2004) |
Brazil | |
| Cassedanne et al. (1982) +1 other reference |
| sergio varvello | |
| Chukanov et al. (2014) | |
| luigi chiappino specimen +1 other reference | |
| Self collect on my mineral trip ... |
| Hatert et al. (2010) +1 other reference | |
| Cassedanne et al. (1981) |
| Atencio et al. (2004) |
| Cassedanne et al. (1999) | |
| Sergio Varvello collection |
| Cassedanne et al. (1991) |
Chile | |
| SEM-EDS by Joy Desor (valence of Fe) |
China | |
| Yang et al. (2026) |
Czech Republic (TL) | |
| new data on the type material. Journal of GEOsciences: 45 (1-2) +2 other references |
France | |
| Chollet Pascal collection - EDS ... |
| Uwe Kolitsch (SXRD-analysis of Gert Schöneborn and Heinz Förch samples) |
| Cuchet et al. (2000) | |
| Queneau (n.d.) |
| Fontan and al. (1981) |
| Lièvre et al. (2002) |
| Queneau (n.d.) |
| Gayraud et al. (2011) +1 other reference |
Germany | |
| Wittern (2001) |
| Keck (1987) |
| Weiß (1990) |
| web.archive.org (2001) |
| Pöllmann et al. (2005) |
| Lapis 33 (7-8) |
| Witzke et al. (1997) |
Italy | |
| collected by F. Castellaro and probed ... |
| Gianluca Armellino et al. (2024) |
| Conti-Vecchi G. & Stara P. (1991) |
Madagascar | |
| Behier (1960) |
Namibia | |
| von Bezing (2007) |
| Keller (1974) | |
| von Bezing (2007) |
| von Bezing (2007) |
| von Bezing (2007) | |
Portugal | |
| Henk Smeets' mineral collection - ... | |
| Found by and in the collection of ... |
| Schnorrer-Köhler et al. (1991) |
| Alves (n.d.) | |
| Rewitzer et al. (1984) +1 other reference |
| Alves (n.d.) | |
| Pedro Alves analytical data and ... |
| Correia Neves (1966) |
Rwanda | |
| Canadian Mineralogist 42:697-704 (2004) |
Spain | |
| Calvo et al. (2011) |
UK | |
| Elton et al. (1996) +2 other references |
USA | |
| Denicourt +1 other reference |
| Newmont Mining Corporation |
| Ex-Martin Jensen collection | |
| Silver Coin Mine. Compact Disc. Paul ... |
| Castor et al. (2004) | |
| Hanahan (1985) |
| Smith et al. (2000) |
Uzbekistan | |
| Mineraly Uzbekistana (Minerals of the Uzbekistan) |
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Eduardo claim, Barra do Cuieté, Conselheiro Pena, Minas Gerais, Brazil