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Grattarolaite Mineral Data
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General Grattarolaite Information
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 Chemical Formula: |
Fe+++3O3(PO4) |
| Composition: |
Molecular Weight = 310.51 gm |
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Iron 53.96 % Fe 77.14 % Fe2O3 |
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Phosphorus 9.98 % P 22.86 % P2O5 |
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Oxygen 36.07 % O |
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______ ______ |
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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. |
| Name Pronunciation: |
Grattarolaite + Pronunciation  |
| Synonym: |
ICSD 36207 |
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IMA1995-037 |
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PDF 37-61 |
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Grattarolaite Image |
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Images:
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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 |
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Grattarolaite Crystallography
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| 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 Pyramidal H-M Symbol (3m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.09(1), 1.623(0.23), 2.078(0.2), |
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Physical Properties of Grattarolaite
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| Cleavage: |
None |
| Color: |
Brown, Red brown. |
| Density: |
4.07 |
| Diaphaneity: |
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 |
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Optical Properties of Grattarolaite
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| 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
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Calculated Properties of Grattarolaite
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| Electron Density: |
Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Grattarolaite =5.44 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEGrattarolaite = 16.85 barns/electron
U=PEGrattarolaite x rElectron Density= 87.94 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grattarolaite is Not Radioactive |
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Grattarolaite Classification
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| Dana Class: |
38.05.12.01 (38)Anhydrous Phosphates, etc |
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(38.05)with miscellaneous formulae |
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(38.05.12)Dana Group |
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38.05.12.01 Grattarolaite! Fe3O3(PO4) R 3m 3m |
| Strunz Class: |
08.BE.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.B - Phosphates, etc. with Additional Anions, without H2O |
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08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1 |
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08.BE.10 Grattarolaite! Fe3O3(PO4) R 3m 3m |
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Other Grattarolaite Information
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| 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 - 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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Grattarolaite
Fe+++3O3(PO4)
Dana No: 38.05.12.01 Strunz No: 08.BE.10
Locality:
Notes:
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