Grattarolaite Mineral Data

Grattarolaite Mineral Data +

General Grattarolaite Information

Chemical Formula:

Fe+++3O3(PO4)

Composition:

Molecular Weight = 310.51 gm

Iron 53.96 % Fe 77.14 % Fe₂O₃

Phosphorus 9.98 % P 22.86 % P₂O₅

Oxygen 36.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₃O₃(PO₄)

Environment:

As nodules about 1 cm in diameter with cavities lined with aggregates up to 1 mm long.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

The Castelnovo mine, Santa Barbara lignite area, Upper Arno River Vally, 30 km SE of Florence, Italy Link to MinDat.org Location Data.

Name Origin:

For Giuseppe Grattarola (1905-1988), professor of mineralogy at the University of Florence, Italy.

Synonym:

ICSD 36207

IMA1995-037

PDF 37-61

Grattarolaite Image

Images:

Click Here for Larger Grattarolaite Image

Grattarolaite Rodolicoite

Comments: Brown grattarolaite, intimately intergrown with brown rodolicoite.
Location: Castelnuovo Mine, Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Grattarolaite Crystallography

Axial Ratios:

a:c = 1:0.85751

Cell Dimensions:

a = 7.994, c = 6.855, Z = 4; V = 379.37 Den(Calc)= 5.44

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 3.09(1), 1.623(0.23), 2.078(0.2),

Physical Properties of Grattarolaite

Cleavage:

None

Color:

Brown, Red brown.

Density:

4.07

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Luster:

Greasy (Oily)

Streak:

brown

Optical Properties of Grattarolaite

Optical Data:

NCalc= 2.55 - from Gladstone-Dale relationship (KC = 0.2848) where Ncalc=Dcalc*KC+1
NCalc= 2.16 - from Gladstone-Dale relationship (KC = 0.2848) where Ncalc=Dmeas*KC+1

Calculated Properties of Grattarolaite

Electron Density:

r_electron=5.22 gm/cc
note: r_{Grattarolaite}=5.44 gm/cc.

Fermion Index

Fermion Index = 0.01161
Boson Index = 0.98839

Photoelectric:

PE_{Grattarolaite}= 16.85 barns/electron
U=PE_{Grattarolaite} x r_electron= 87.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Grattarolaite is Not Radioactive

Grattarolaite Classification

Dana Class:

38.5.12.1 (38)Anhydrous Phosphates, etc

(38.5)with miscellaneous formulae

(38.5.12)Dana Group

38.5.12.1 Grattarolaite ! Fe3O3(PO4) R 3m 3m

Strunz Class:

VII/B.09-15 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.09 - Aerugite - Aangelellite series

VII/B.09-10 Aerugite ([],Ni)9(AsO4)2(AsO6)(?) R 3m 3 2/m

VII/B.09-15 Grattarolaite Fe3O3(PO4) R 3m 3m

VII/B.09-20 Angelellite Fe4(AsO4)2O3 P1 1

Other Grattarolaite Information

References:

NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.9,p1101-1106,1997)

See Also:

Links to other databases for Grattarolaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Grattarolaite

Fe+++3O3(PO4)
Dana No: 38.5.12.1 Strunz No: VII/B.09-15
Locality:

Notes: