Paracoquimbite Mineral Data (original) (raw)

General Paracoquimbite Information

Help on Chemical Formula: Chemical Formula:

Fe+++2(SO4)3•9(H2O)

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

Fe3+2(SO4)3•9(H2O)

Help on Environment: Environment:

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

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1935

Help on Locality: Locality:

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

Help on Name Origin: Name Origin:

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

Help on Name Pronunciation: Name Pronunciation:

Paracoquimbite + Pronunciation Say PARACOQUIMBITE

Help on Synonym: Synonym:

ICSD 15211

PDF 27-254

Paracoquimbite Image

Click Here for Larger Paracoquimbite Image in a New Browser Window Images:

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

Paracoquimbite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:4.6935

Help on Cell Dimensions: Cell Dimensions:

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

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

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

Help on Forms: Forms:

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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) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Paracoquimbite Structure Window 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

Help on Cleavage: Cleavage:

{0112} Indistinct, {1014} Indistinct

Help on Color: Color:

Light violet.

Help on Density: Density:

2.11

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Hardness: Hardness:

2.5 - Finger Nail

Help on Luster: Luster:

Vitreous (Glassy)

Optical Properties of Paracoquimbite

Help on Gladstone-Dale: 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

Help on Optical Data: Optical Data:

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

Calculated Properties of Paracoquimbite

Help on Electron Density: Electron Density:

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

Help on Fermion Index: Fermion Index:

Fermion Index = 0.005788726
Boson Index = 0.994211274

Help on Photoelectric: Photoelectric:

PEParacoquimbite = 6.81 barns/electron
U=PEParacoquimbite x rElectron Density= 14.63 barns/cc.

Help on Radioactivity: Radioactivity:

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

Paracoquimbite Classification

Help on Dana Class: Dana Class:

29.08.04.01 (29)Hydrated Acid and Sulfates

(29.08)where (A)2 (XO4)3 � x(H2O)

(29.08.04)Dana Group

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

Help on Strunz Class: 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

Help on References: References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: 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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Ask about Paracoquimbite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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

Paracoquimbite

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

Notes: