Phosphosiderite Mineral Data

General Phosphosiderite Information

Chemical Formula:

Fe+++PO4•2(H2O)

Composition:

Molecular Weight = 186.85 gm

Iron 29.89 % Fe 42.73 % Fe₂O₃

Phosphorus 16.58 % P 37.98 % P₂O₅

Hydrogen 2.16 % H 19.28 % H₂O

Oxygen 51.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(PO₄)•2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

Kalterborn Grube, Eisenfeld, Siegen, Germany Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition, PHOSPHrous and SIDERos, Iron..

Name Pronunciation:

Phosphosiderite

Synonym:

ICSD 34007

Metastrengite

PDF 33-666

Phosphosiderite Image

Images:

Phosphosiderite Barbosalite

Comments: Transparent, brown crystal of phosphosiderite on black barbosalite.
Location: Bull Moose mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Tinsleyite Phosphosiderite Rockbridgeite

Comments: Violet botryoidal tinsleyite on bluish-purple botryoidal phosphosiderite on dark, massive rockbridgeite.
Location: Bendada, Guarda, Portugal. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Phosphosiderite Crystallography

Axial Ratios:

a:b:c =0.539:1:0.8804

Cell Dimensions:

a = 5.32, b = 9.87, c = 8.69, Z = 4; beta = 90.6° V = 456.27 Den(Calc)= 2.72

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.78(1), 4.37(0.8), 4.69(0.8),

Forms:

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Forms: ( 1 0 3) ( 0 1 0) ( 1 0 1) ( 1 1 0) ( 0 1 1) ( 0 0 1)

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Physical Properties of Phosphosiderite

Cleavage:

{010} Perfect, {001} Distinct

Color:

Colorless, Purple, Pink, Red, Red violet.

Density:

2.76

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Phosphosiderite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2641,KPDmeas= 0.2603,KC= 0.2697
Ncalc = 1.73 - 1.74

Optical Data:

Biaxial (-), a=1.692, b=1.725, g=1.738, bire=0.0460, 2V(Calc)=62, 2V(Meas)=62.

Calculated Properties of Phosphosiderite

Electron Density:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Phosphosiderite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.0065862806
Boson Index = 0.9934137194

Photoelectric:

PE_{Phosphosiderite}= 9.60 barns/electron
U=PE_{Phosphosiderite} x rElectron Density= 25.99 barns/cc.

Radioactivity:

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

Phosphosiderite Classification

Dana Class:

40.04.03.02 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 ï¿½ x(H2O)

(40.04.03)Metavariscite group

40.04.03.01 Metavariscite AlPO4•2(H2O) P 2₁/n 2/m

40.04.03.02 Phosphosiderite FePO4•2(H2O) P 2₁/n 2/m

40.04.03.03 Kolbeckite ScPO4•2(H2O) P 2₁/n 2/m

Strunz Class:

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

08.C - Phosphates without Additional Anions, with H2O

08.CD -With only medium-sized cations, RO4:H2O = 1:2

08.CD.05 Kolbeckite ScPO4•2(H2O) P 2₁/n 2/m

08.CD.05 Metavariscite AlPO4•2(H2O) P 2₁/n 2/m

08.CD.05 Phosphosiderite FePO4•2(H2O) P 2₁/n 2/m

Other Phosphosiderite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Phosphosiderite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Phosphosiderite

Fe+++PO4•2(H2O)
Dana No: 40.04.03.02 Strunz No: 08.CD.05
Locality:

Notes:

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