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 (1905ï¿½1988), 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 cittï¿½ dï¿½Italia

Name Pronunciation:

Rodolicoite + Pronunciation

Synonym:

ICSD 38062

IMA1995-038

PDF 50-1635

Rodolicoite Image

Images:

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

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 - Trapezohedral H-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),

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:

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