Coquimbite Mineral Data

Coquimbite Mineral Data +

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General Coquimbite 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) 1841

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the province of Coquimbo, Chile.

Synonym:

ICSD 15182

PDF 44-1425

Coquimbite Image

Images:

Coquimbite

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

Images:

Coquimbite Goldichite 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

Coquimbite Crystallography

Axial Ratios:

a:c = 1:1.56418

Cell Dimensions:

a = 10.922, c = 17.084, Z = 4; V = 1,764.92 Den(Calc)= 2.12

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3c

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

By Intensity(I/I_o): 8.26(1), 2.759(0.75), 5.45(0.65),

Forms:

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Forms: [ 1 1 1] [ 1 1 0] [ 0 1 0] [ 0 0 1]

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Crystal Structure:

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Fang J H , Robinson P D , American Mineralogist , 55 (1970) p.1534-1540, Crystal structures and mineral chemistry of hydrated ferric sulfates. I. The, crystal structure of coquimbite

View Additional jPOWD Structure files for Coquimbite
[1]

Physical Properties of Coquimbite

Cleavage:

[1011] Imperfect

Color:

Greenish white, Bluish white, Light violet, Yellowish white, Brownish white.

Density:

2 - 2.1, Average = 2.04

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2 - Gypsum

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Coquimbite

Dichroism (e):

none.

Dichroism (w):

none.

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

Optical Data:

Uniaxial (+), w=1.55, e=1.557, bire=0.0070.

Calculated Properties of Coquimbite

Electron Density:

r_electron=2.16 gm/cc
note: r_Coquimbite=2.12 gm/cc.

Fermion Index

Fermion Index = 0.00578
Boson Index = 0.99422

Photoelectric:

PE_Coquimbite= 6.81 barns/electron
U=PE_Coquimbite x r_electron= 14.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Coquimbite is Not Radioactive

Coquimbite Classification

Dana Class:

29.8.3.1 (29)Hydrated Acid and Sulfates

(29.8)where (A)2 (XO4)3 · x(H2O)

(29.8.3)Dana Group

29.8.3.1 Coquimbite Fe2(SO4)3·9(H2O) P 3c 3 2/m

Strunz Class:

VI/C.08-40 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 Coquimbite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Coquimbite

Fe+++2(SO4)3·9(H2O)
Dana No: 29.8.3.1 Strunz No: VI/C.08-40
Locality:

Notes: