Cyrilovite Mineral Data

Cyrilovite Mineral Data

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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, G?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 - TrapezohedralH-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),

Crystal Structure:

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Cozzupoli D , Grubessi O , Mottana A , Zanazzi P F , Mineralogy and Petrology , 37 (1987) p.1-14, Cyrilovite from Italy: structure and crystal chemistry, Locality: Bosa, Sardinia, Italy

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

Optical Data:

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

Calculated Properties of Cyrilovite

Electron Density:

r_electron=3.04 gm/cc
note: r_Cyrilovite=3.08 gm/cc.

Fermion Index

Fermion Index = 0.00755
Boson Index = 0.99245

Photoelectric:

PE_Cyrilovite= 10.94 barns/electron
U=PE_Cyrilovite x r_electron= 33.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cyrilovite is Not Radioactive

Cyrilovite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.8)Dana Group

42.7.8.1 Cyrilovite NaFe3(PO4)2(OH)4·2(H2O) P 4₁2₁21,P 4₃2₁21 4 2 2

42.7.8.2 Wardite NaAl3(PO4)2(OH)4·2(H2O) P 4₁2₁2 4 2 2

Strunz Class:

VII/D.51-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.51 - Wardite - Millisite series

VII/D.51-10 Wardite NaAl3(PO4)2(OH)4·2(H2O) P 4₁2₁2 4 2 2

VII/D.51-20 Cyrilovite NaFe3(PO4)2(OH)4·2(H2O) P 4₁2₁21,P 4₃2₁21 4 2 2

VII/D.51-30 Millisite (Na,K)CaAl6(PO4)4(OH)9·3(H2O) P 4₁2₁2,P 4₃2₁2 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)

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Cyrilovite

NaFe+++3(PO4)2(OH)4·2(H2O)
Dana No: 42.7.8.1 Strunz No: VII/D.51-20
Locality:

Notes: