Paracoquimbite Mineral Data

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)

Environment:

Formed in the oxidized zone of pyritic hydrothermal orebodies, especially in arid regions.

IMA Status:

Valid Species (Pre-IMA) 1935

Locality:

Tierra Amarilla, southeast of Copiapo, Atacama, Chile. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for near and its relation to coquimbite.

Name Pronunciation:

Paracoquimbite + Pronunciation

Synonym:

ICSD 15211

PDF 27-254

Paracoquimbite Image

Images:

Paracoquimbite

Comments: Light violet aggregate of paracoquimbite crystals.
Location: California Institute of Technology W-19151. Scale: See Image.
© Rruff Database

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 - Rhombohedral H-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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Forms: ( 1 1 2) ( 1 1 4) ( 1 1 1) ( 1 1 7) ( 1 0 0) ( 1 1 5) ( 1 1 10) ( 0 0 1)

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Physical Properties of Paracoquimbite

Cleavage:

{0112} Indistinct, {1014} Indistinct

Color:

Light violet.

Density:

2.11

Diaphaneity:

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
Ncalc = 1.56

Optical Data:

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

Calculated Properties of Paracoquimbite

Electron Density:

Bulk Density (Electron Density)=2.15 gm/cc
note: Specific Gravity of Paracoquimbite =2.11 gm/cc.

Fermion Index:

Fermion Index = 0.005788726
Boson Index = 0.994211274

Photoelectric:

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

Radioactivity:

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

Paracoquimbite Classification

Dana Class:

29.08.04.01 (29)Hydrated Acid and Sulfates

(29.08)where (A)2 (XO4)3 ï¿½ x(H2O)

(29.08.04)Dana Group

29.08.04.01 Paracoquimbite Fe2(SO4)3•9(H2O) R 3 3

Strunz Class:

07.CB.50 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CB -With only medium-sized cations

07.CB.50 Coquimbite Fe2(SO4)3•9(H2O) P 3c 3 2/m

07.CB.50 Paracoquimbite Fe2(SO4)3•9(H2O) R 3 3

Other Paracoquimbite Information

References:

NAME( AntBidBlaNic5) 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 - 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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Paracoquimbite

Fe+++2(SO4)3•9(H2O)
Dana No: 29.08.04.01 Strunz No: 07.CB.50
Locality:

Notes:

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