Kornelite Mineral Data

Kornelite Mineral Data +

General Kornelite Information

Chemical Formula:

Fe+++2(SO4)3·7(H2O)

Composition:

Molecular Weight = 525.99 gm

Iron 21.23 % Fe 30.36 % Fe₂O₃

Hydrogen 2.68 % H 23.98 % H₂O

Sulfur 18.29 % S 45.66 % SO₃

Oxygen 57.79 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂(SO₄)₃·7(H₂O)

Environment:

Secondary mineral formed from the oxidation of iron sulfides.

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Szomolnok Copper Mine, Slovakia (Formerly Hungary). Link to MinDat.org Location Data.

Name Origin:

Named after Kornel Hlavacsek (1835-1914), hungarian mining engineer at the Szomolnok copper mine.

Synonym:

ICSD 10374

PDF 44-1426

Kornelite Image

Images:

Kornelite

Comments: Sulfate matrix with several 1 cm sprays of kornelite. This specimen has to be protected from air as it is readily soluble in water.
Location: Rio Tinto Mine, Huelva, Spain. Scale: Picture size 1 cm.
© John Veevaert

Kornelite Crystallography

Axial Ratios:

a:b:c =0.7107:1:0.2696

Cell Dimensions:

a = 14.3, b = 20.12, c = 5.425, Z = 4; beta = 96.8° V = 1,549.88 Den(Calc)= 2.25

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 10(1), 4.67(0.8), 6.64(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Robinson P D , Fang J H , American Mineralogist , 58 (1973) p.535-539, Crystal structures and mineral chemistry of hydrated ferric sulphates. III. The, crystal structure of kornelite

Physical Properties of Kornelite

Cleavage:

[010] Imperfect

Color:

Pale rose pink, Violet.

Density:

2.306

Diaphaniety:

Transparent to translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Luminescence:

None.

Luster:

Silky

Streak:

pale red

Optical Properties of Kornelite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2664,KPDmeas= 0.2599,KC= 0.258

Optical Data:

Biaxial (+), a=1.572, b=1.586, g=1.64, bire=0.0680, 2V(Calc)=56, 2V(Meas)=49-62. Dispersion very weak, r > v.

Calculated Properties of Kornelite

Electron Density:

r_electron=2.33 gm/cc
note: r_Kornelite=2.31 gm/cc.

Fermion Index

Fermion Index = 0.00615
Boson Index = 0.99385

Photoelectric:

PE_Kornelite= 7.30 barns/electron
U=PE_Kornelite x r_electron= 17.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kornelite is Not Radioactive

Kornelite Classification

Dana Class:

29.8.2.1 (29)Hydrated Acid and Sulfates

(29.8)where (A)2 (XO4)3 · x(H2O)

(29.8.2)Dana Group

29.8.2.1 Kornelite Fe2(SO4)3·7(H2O) P 2₁/c 2/m

Strunz Class:

VI/C.08-30 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 Kornelite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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

Kornelite

Fe+++2(SO4)3·7(H2O)
Dana No: 29.8.2.1 Strunz No: VI/C.08-30
Locality:

Notes: