Rodolicoite Mineral Data

General Rodolicoite Information

Chemical Formula:

Fe+++PO4

Composition:

Molecular Weight = 150.82 gm

Iron 37.03 % Fe 52.94 % Fe₂O₃

Phosphorus 20.54 % P 47.06 % P₂O₅

Oxygen 42.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(PO₄)

Environment:

As nodules in cavities intergrown with grattarolaite. Isostructural with berlinite; polymorphic relationship with heterosite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

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

Name Origin:

Named after Francesco Rodolico (1905–1988), professor of mineralogy, University of Florence, Italy, specialist of the history of geology and of building and ornamental materials, au thor of Le pietre delle città d’Italia

Name Pronunciation:

Rodolicoite + Pronunciation

Synonym:

ICSD 38062

IMA1995-038

PDF 50-1635

Rodolicoite Image

Images:

Rodolicoite Grattarolaite

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

Rodolicoite Crystallography

Axial Ratios:

a:c = 1:2.22167

Cell Dimensions:

a = 5.048, c = 11.215, Z = 3; V = 247.50 Den(Calc)= 3.04

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: R 3121

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

By Intensity(I/I_o): 3.445(1), 4.36(0.19), 2.362(0.14),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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Long G J , Cheetham A K , Battle P D , Inorganic Chemistry , 22 (1983) p.3012-3016, Study of the iron-phosphorus-oxygen system by Mossbauer effect,, neutron diffraction, magnetic susceptibility, and analytical electron, microscopy: some pitfalls and solutions in the analysis of a complex mixture, Locality: synthetic

Physical Properties of Rodolicoite

Cleavage:

None

Color:

Brown, Red brown.

Density:

3.07

Diaphaneity:

Opaque

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Luster:

Greasy (Oily)

Streak:

brown

Optical Properties of Rodolicoite

Optical Data:

NCalc= 1.77 - from Gladstone-Dale relationship (KC = 0.2529) where Ncalc=Dcalc*KC+1
NCalc= 1.78 - from Gladstone-Dale relationship (KC = 0.2529) where Ncalc=Dmeas*KC+1

Calculated Properties of Rodolicoite

Electron Density:

Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Rodolicoite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.008053895
Boson Index = 0.991946105

Photoelectric:

PE_Rodolicoite= 12.13 barns/electron
U=PE_Rodolicoite x rElectron Density= 35.69 barns/cc.

Radioactivity:

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

Rodolicoite Classification

Dana Class:

38.04.02.03 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.02)Berlinite Group

38.04.02.01 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

38.04.02.02 Alarsite! AlAsO4 P 3₁21,P 3₂21 3 2

38.04.02.03 Rodolicoite! FePO4 R 3121 3 2

Strunz Class:

08.AA.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AA -With small cations (some also with larger ones)

08.AA.05 Alarsite! AlAsO4 P 3₁21,P 3₂21 3 2

08.AA.05 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

08.AA.05 Rodolicoite! FePO4 R 3121 3 2

Other Rodolicoite Information

References:

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

See Also:

Links to other databases for Rodolicoite :
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
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Rodolicoite Specimen Label here :

Rodolicoite

Fe+++PO4
Dana No: 38.04.02.03 Strunz No: 08.AA.05
Locality:

Notes: