Phosphosiderite Mineral Data

Phosphosiderite Mineral Data +

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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..

Synonym:

ICSD 34007

Metastrengite

PDF 33-666

Phosphosiderite Image

Images:

Click Here for Larger Phosphosiderite Image

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:

Phosphosiderite Tinsleyite 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 - PrismaticH-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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Crystal Structure:

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Moore P B , American Mineralogist , 51 (1966) p.168-176, The crystal structure of metastrengite and its relationship to strengite and, phosphophyllite

Physical Properties of Phosphosiderite

Cleavage:

[010] Perfect, [001] Distinct

Color:

Colorless, Purple, Pink, Red, Red violet.

Density:

2.76

Diaphaniety:

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

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:

r_electron=2.71 gm/cc
note: r_{Phosphosiderite}=2.72 gm/cc.

Fermion Index

Fermion Index = 0.00658
Boson Index = 0.99342

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Phosphosiderite is Not Radioactive

Phosphosiderite Classification

Dana Class:

40.4.3.2 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.3)Dana Group

40.4.3.1 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

40.4.3.2 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

40.4.3.3 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/C.09-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.09 - Variscite group

VII/C.09-10 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

VII/C.09-88 Parascorodite! FeAsO4·2(H2O) HEX ? Hex

VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra

Other Phosphosiderite Information

References:

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

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Phosphosiderite

Fe+++PO4·2(H2O)
Dana No: 40.4.3.2 Strunz No: VII/C.09-20
Locality:

Notes: