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Santabarbaraite Mineral Data

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General Santabarbaraite Information

Help on Chemical  Formula: Chemical Formula: Fe+++3(PO4)2(OH)3•5(H2O)
Help on Composition: Composition: Molecular Weight = 493.39 gm
   Magnesium    0.34 %  Mg    0.57 % MgO
   Manganese    1.56 %  Mn    2.24 % Mn2O3
   Iron        30.67 %  Fe   43.86 % Fe2O3
   Phosphorus  12.87 %  P    29.49 % P2O5
   Hydrogen     2.67 %  H    23.84 % H2O
   Oxygen      51.88 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+2.71Mn3+0.14Mg0.07(PO4)2.05(OH)2.54•5.26(H2O)
Help on Environment: Environment: Found in cavities in concretions. Altered from vivianite in a clastic sequence.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Valdarno, Tuscany, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Saint Barbara (4th century), a martyred christian who took refuge in the mines and converted many of the miners, hence her patronage to miners.
Help on Synonym: Synonym: Azovskite - massive non-crystalline hydrous Fe-phosphate mixed with goethite

Santabarbaraite Image

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Comments: Orange santabarbaraite pseudomorphous after vivianite.
Location: Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Santabarbaraite Crystallography

Help on Crystal System: Crystal System: Amorphous- No Crystals

Physical Properties of Santabarbaraite

Help on Cleavage: Cleavage: {010} Parting
Help on Color: Color: Light brown, Brown.
Help on Density: Density: 2.42
Help on Diaphaneity: Diaphaneity: Translucent
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 Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: amber

Optical Properties of Santabarbaraite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2872,KC= 0.2811
Ncalc = 1.68
Help on Optical Data: Optical Data: Isotropic, n=1.695.

Calculated Properties of Santabarbaraite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Santabarbaraite =2.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.007100911
Boson Index = 0.992899089
Help on Photoelectric: Photoelectric: PESantabarbaraite = 10.02 barns/electron
U=PESantabarbaraite x rElectron Density= 24.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Santabarbaraite is Not Radioactive

Santabarbaraite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.10)where (AB)3 (XO4)2 Zq � x(H2O)
  (42.10.01)Ferrisymplesite Group Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None Santabarbaraite! Fe3(PO4)2(OH)3•5(H2O) None
Help on  Strunz Class: Strunz Class: 08.CE.80 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
08.CE.80 Santabarbaraite! Fe3(PO4)2(OH)3•5(H2O) None

Other Santabarbaraite Information

Help on References: References: NAME( AmMin, v 88, p 1838) PHYS. PROP.(AmMin, v 88, p 1838) OPTIC PROP.(AmMin, v 88, p 1838)
Help on See Also: See Also: Links to other databases for Santabarbaraite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.CE.80





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