Santabarbaraite Mineral Data

General Santabarbaraite Information

Chemical Formula:

Fe+++3(PO4)2(OH)3•5(H2O)

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

Empirical Formula:

Fe³⁺_2.71Mn³⁺_0.14Mg_0.07(PO₄)_2.05(OH)_2.54•5.26(H₂O)

Environment:

Found in cavities in concretions. Altered from vivianite in a clastic sequence.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Valdarno, Tuscany, Italy. Link to MinDat.org Location Data.

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.

Synonym:

Azovskite - massive non-crystalline hydrous Fe-phosphate mixed with goethite

IMA2000-052

Santabarbaraite Image

Images:

Santabarbaraite

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

Crystal System:

Amorphous- No Crystals

Physical Properties of Santabarbaraite

Cleavage:

{010} Parting

Color:

Light brown, Brown.

Density:

2.42

Diaphaneity:

Translucent

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Luster:

Vitreous - Greasy

Streak:

amber

Optical Properties of Santabarbaraite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2872,KC= 0.2811
Ncalc = 1.68

Optical Data:

Isotropic, n=1.695.

Calculated Properties of Santabarbaraite

Electron Density:

Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Santabarbaraite =2.42 gm/cc.

Fermion Index:

Fermion Index = 0.007100911
Boson Index = 0.992899089

Photoelectric:

PE_{Santabarbaraite}= 10.02 barns/electron
U=PE_{Santabarbaraite} x rElectron Density= 24.24 barns/cc.

Radioactivity:

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

Santabarbaraite Classification

Dana Class:

42.10.01.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.10)where (AB)3 (XO4)2 Zq ï¿½ x(H2O)

(42.10.01)Ferrisymplesite Group

42.10.01.01 Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None

42.10.01.02 Santabarbaraite! Fe3(PO4)2(OH)3•5(H2O) None

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 ï¿½ 1:2.5

08.CE.80 Santabarbaraite! Fe3(PO4)2(OH)3•5(H2O) None

Other Santabarbaraite Information

References:

NAME( AmMin, v 88, p 1838) PHYS. PROP.(AmMin, v 88, p 1838) OPTIC PROP.(AmMin, v 88, p 1838)

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

Santabarbaraite

Fe+++3(PO4)2(OH)3•5(H2O)
Dana No: 42.10.01.02 Strunz No: 08.CE.80
Locality:

Notes:

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