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Grattarolaite Mineral Data

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General Grattarolaite Information

Help on Chemical  Formula: Chemical Formula: Fe+++3O3(PO4)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+3O3(PO4)
Help on Environment: Environment: As nodules about 1 cm in diameter with cavities lined with aggregates up to 1 mm long.
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: The Castelnovo mine, Santa Barbara lignite area, Upper Arno River Vally, 30 km SE of Florence, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Giuseppe Grattarola (1905-1988), professor of mineralogy at the University of Florence, Italy.
Help on Name Pronunciation: Name Pronunciation: Grattarolaite + Pronunciation Say GRATTAROLAITE
Help on Synonym: Synonym: ICSD 36207
  PDF 37-61

Grattarolaite Image

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  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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.85751
Help on Cell Dimensions: Cell Dimensions: a = 7.994, c = 6.855, Z = 4; V = 379.37 Den(Calc)= 5.44
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.09(1), 1.623(0.23), 2.078(0.2),

Physical Properties of Grattarolaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Red brown.
Help on Density: Density: 4.07
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: brown

Optical Properties of Grattarolaite

Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Grattarolaite =5.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGrattarolaite = 16.85 barns/electron
U=PEGrattarolaite x rElectron Density= 87.94 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grattarolaite is Not Radioactive

Grattarolaite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.05)with miscellaneous formulae
  (38.05.12)Dana Group Grattarolaite! Fe3O3(PO4) R 3m 3m
Help on  Strunz Class: Strunz Class: 08.BE.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1
08.BE.10 Grattarolaite! Fe3O3(PO4) R 3m 3m

Other Grattarolaite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.9,p1101-1106,1997)
Help on See Also: See Also: Links to other databases for Grattarolaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.BE.10





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