Cyrilovite Mineral Data

General Cyrilovite Information

Chemical Formula:

NaFe+++3(PO4)2(OH)4•2(H2O)

Composition:

Molecular Weight = 484.53 gm

Sodium 4.74 % Na 6.40 % Na₂O

Iron 34.58 % Fe 49.44 % Fe₂O₃

Phosphorus 12.78 % P 29.30 % P₂O₅

Hydrogen 1.66 % H 14.87 % H₂O

Oxygen 46.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaFe³⁺₃(PO₄)₂(OH)₄•2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after its locality Cyrilov, Czechoslovakia.

Synonym:

ICSD 90612

PDF 43-672

Cyrilovite Image

Images:

Cyrilovite

Comments: Greenish-yellow crystals of cyrilovite in matrix.
Location: Rengersdorf, GÃ¶rlitz, Oberlausitz, Saxony, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Cyrilovite Crystallography

Axial Ratios:

a:c = 1:2.64085

Cell Dimensions:

a = 7.334, c = 19.368, Z = 4; V = 1,041.76 Den(Calc)= 3.09

Crystal System:

Tetragonal - Trapezohedral H-M Symbol (4 2 2) Space Group: P 4₁2₁21,P 4₃2₁21

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

By Intensity(I/I_o): 4.85(1), 2.658(0.8), 3.186(0.8),

Physical Properties of Cyrilovite

Cleavage:

None

Color:

Yellow, Orange yellow, Brown.

Density:

3.08

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Cyrilovite

Gladstone-Dale:

CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2544,KPDmeas= 0.2552,KC= 0.2721
Ncalc = 1.84

Optical Data:

Uniaxial (-), e=1.769, w=1.803, bire=0.0340.

Calculated Properties of Cyrilovite

Electron Density:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Cyrilovite =3.08 gm/cc.

Fermion Index:

Fermion Index = 0.007554886
Boson Index = 0.992445114

Photoelectric:

PE_Cyrilovite= 10.94 barns/electron
U=PE_Cyrilovite x rElectron Density= 33.24 barns/cc.

Radioactivity:

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

Cyrilovite Classification

Dana Class:

42.07.08.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq ï¿½ x(H2O)

(42.07.08)Cyrilovite Group

42.07.08.01 Cyrilovite NaFe3(PO4)2(OH)4•2(H2O) P 4₁2₁21,P 4₃2₁21 4 2 2

42.07.08.02 Wardite NaAl3(PO4)2(OH)4•2(H2O) P 4₁2₁2 4 2 2

Strunz Class:

08.DL.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1

08.DL.10 Cyrilovite NaFe3(PO4)2(OH)4•2(H2O) P 4₁2₁21,P 4₃2₁21 4 2 2

08.DL.10 Millisite (Na,K)CaAl6(PO4)4(OH)9•3(H2O) P 4₁2₁2,P 4₃2₁2 4 2 2

08.DL.10 Wardite NaAl3(PO4)2(OH)4•2(H2O) P 4₁2₁2 4 2 2

Other Cyrilovite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Cyrilovite

NaFe+++3(PO4)2(OH)4•2(H2O)
Dana No: 42.07.08.01 Strunz No: 08.DL.10
Locality:

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