Phosphosiderite Mineral Data
General Phosphosiderite Information
Chemical Formula:
Fe+++PO4•2(H2O)
Composition:
Molecular Weight = 186.85 gm
Iron 29.89 % Fe 42.73 % Fe2 O3
Phosphorus 16.58 % P 37.98 % P2 O5
Hydrogen 2.16 % H 19.28 % H2 O
Oxygen 51.38 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Fe3+ (PO4 )•2(H2 O)
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:
Images:
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
X Ray Diffraction:
By Intensity(I/Io ): 2.78(1), 4.37(0.8), 4.69(0.8),
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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:
PEPhosphosiderite = 9.60 barns/electronU=PEPhosphosiderite x r Electron 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 � 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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Phosphosiderite
Fe+++PO4•2(H2O)
Dana No: 40.04.03.02 Strunz No: 08.CD.05
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