Paracoquimbite Mineral Data

Paracoquimbite Mineral Data
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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

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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)

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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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Paracoquimbite

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

 

Notes: