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Coquimbite Mineral Data

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General Coquimbite 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: Water soluble efflorescence commonly produced by mine fires or other oxidation with iron sulfide minerals. Dimorphous with paracoquimbite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1841
Help on Locality: Locality: Coquimbo province, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Coquimbite + Pronunciation Say COQUIMBITE
Help on Synonym: Synonym: ICSD 15182
  PDF 44-1425

Coquimbite Image

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Comments: Brownish yellow tabular crystals of coquimbite.
Location: Lavender Pit, Bisbee, Cochise County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Goldichite   Coquimbite   Ferricopiapite

Comments: Prismatic to fibrous crystals of goldichite on white massive coquimbite with yellow ferricopiapite.
Location: Dexter No. 7 Mine, Calf Mesa, San Rafael Swell, Emery County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Coquimbite rosettes (small bumps) secondarily nucleated on a cryptocrystalline mass. AmMin, v90, p1734.
Location: Vents associated with underground coal fires in the Wuda coal bed of Inner Mongolia. Scale: See Image.
© American Mineralogist

Coquimbite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.56418
Help on Cell Dimensions: Cell Dimensions: a = 10.922, c = 17.084, Z = 4; V = 1,764.92 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.26(1), 2.759(0.75), 5.45(0.65),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 1 1 0) ( 0 1 0) ( 0 0 1)

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Physical Properties of Coquimbite

Help on Cleavage: Cleavage: {1011} Imperfect
Help on Color: Color: Greenish white, Bluish white, Light violet, Yellowish white, Brownish white.
Help on Density: Density: 2 - 2.1, Average = 2.04
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Coquimbite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2611,KPDmeas= 0.27,KC= 0.2632
Ncalc = 1.53 - 1.56
Help on Optical Data: Optical Data: Uniaxial (+), w=1.55, e=1.557, bire=0.0070.

Calculated Properties of Coquimbite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.16 gm/cc
note: Specific Gravity of Coquimbite =2.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.005788726
Boson Index = 0.994211274
Help on Photoelectric: Photoelectric: PECoquimbite = 6.81 barns/electron
U=PECoquimbite x rElectron Density= 14.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Coquimbite is Not Radioactive

Coquimbite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.08)where (A)2 (XO4)3 � x(H2O)
  (29.08.03)Dana Group Coquimbite Fe2(SO4)3•9(H2O) P 3c 3 2/m
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 Coquimbite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Coquimbite :
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

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Dana No: Strunz No: 07.CB.50





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