Paracoquimbite Mineral Data

Paracoquimbite Mineral Data +

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General Paracoquimbite Information

Chemical Formula:

Fe+++2(SO4)3·9(H2O)

Composition:

Molecular Weight = 562.02 gm

Iron 19.87 % Fe 28.41 % Fe₂O₃

Hydrogen 3.23 % H 28.85 % H₂O

Sulfur 17.12 % S 42.74 % SO₃

Oxygen 59.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂(SO₄)₃·9(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1935

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 15211

PDF 27-254

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Paracoquimbite Crystallography

Axial Ratios:

a:c = 1:4.6935

Cell Dimensions:

a = 10.93, c = 51.3, Z = 12; V = 5,307.48 Den(Calc)= 2.11

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 8.26(1), 2.76(0.75), 5.45(0.65),

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Crystal Structure:

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Robinson P D , Fang J H , American Mineralogist , 56 (1971) p.1567-1572, Crystal structures and mineral chemistry of hydrated ferric sulphates: II. The, crystal structure of paracoquimbite

Physical Properties of Paracoquimbite

Cleavage:

[0112] Indistinct, [1014] Indistinct

Color:

Light violet.

Density:

2.11

Diaphaniety:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Optical Properties of Paracoquimbite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2618,KPDmeas= 0.2618,KC= 0.2632

Optical Data:

Uniaxial (+), w=1.55, e=1.555, bire=0.0050.

Calculated Properties of Paracoquimbite

Electron Density:

r_electron=2.15 gm/cc
note: r_{Paracoquimbite}=2.11 gm/cc.

Fermion Index

Fermion Index = 0.00578
Boson Index = 0.99422

Photoelectric:

PE_{Paracoquimbite}= 6.81 barns/electron
U=PE_{Paracoquimbite} x r_electron= 14.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paracoquimbite is Not Radioactive

Paracoquimbite Classification

Dana Class:

29.8.4.1 (29)Hydrated Acid and Sulfates

(29.8)where (A)2 (XO4)3 · x(H2O)

(29.8.4)Dana Group

29.8.4.1 Paracoquimbite Fe2(SO4)3·9(H2O) R 3 3

Strunz Class:

VI/C.08-50 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.08 - Rhomboclase - Meta-alunogen series

VI/C.08-10 Rhomboclase (H5O2)Fe(SO4)2·2(H2O) P nma 2/m 2/m 2/m

VI/C.08-20 Lausenite Fe2(SO4)3·6(H2O) Unk. Mono

VI/C.08-30 Kornelite Fe2(SO4)3·7(H2O) P 2₁/c 2/m

VI/C.08-40 Coquimbite Fe2(SO4)3·9(H2O) P 3c 3 2/m

VI/C.08-50 Paracoquimbite Fe2(SO4)3·9(H2O) R 3 3

VI/C.08-60 Quenstedtite Fe2(SO4)3·10(H2O) P1 1

VI/C.08-70 Alunogen Al2(SO4)3·17(H2O) P1 1

VI/C.08-80 Meta-alunogen Al4(SO4)6·27(H2O) Mono

Other Paracoquimbite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Paracoquimbite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Paracoquimbite

Fe+++2(SO4)3·9(H2O)
Dana No: 29.8.4.1 Strunz No: VI/C.08-50
Locality:

Notes: