Goldichite Mineral Data

Goldichite Mineral Data +

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General Goldichite Information

Chemical Formula:

KFe+++(SO4)2·4(H2O)

Composition:

Molecular Weight = 359.13 gm

Potassium 10.89 % K 13.11 % K₂O

Iron 15.55 % Fe 22.23 % Fe₂O₃

Hydrogen 2.25 % H 20.07 % H₂O

Sulfur 17.86 % S 44.59 % SO₃

Oxygen 53.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe³⁺(SO₄)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 22053

PDF 11-428

Goldichite Image

Images:

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

Goldichite Crystallography

Axial Ratios:

a:b:c =0.9924:1:0.8689

Cell Dimensions:

a = 10.45, b = 10.53, c = 9.15, Z = 4; beta = 101.817° V = 985.51 Den(Calc)= 2.42

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): 3.068(1), 7.35(0.9), 10.29(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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I - Data Info
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Graeber E J , Rosenzweig A , American Mineralogist , 56 (1971) p.1917-1933, The crystal structures of yavapaiite, KFe(SO4)2, and goldichite, KFe(SO4)2.4H2O

Physical Properties of Goldichite

Cleavage:

[100] Perfect

Color:

Light yellow green.

Density:

2.43

Hardness:

2.5 - Finger Nail

Streak:

white

Optical Properties of Goldichite

Gladstone-Dale:

CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2497,KPDmeas= 0.2487,KC= 0.2429

Optical Data:

Biaxial (+), a=1.582, b=1.602, g=1.629, bire=0.0470, 2V(Calc)=84, 2V(Meas)=82.

Calculated Properties of Goldichite

Electron Density:

r_electron=2.45 gm/cc
note: r_Goldichite=2.43 gm/cc.

Fermion Index

Fermion Index = 0.0049
Boson Index = 0.9951

Photoelectric:

PE_Goldichite= 6.70 barns/electron
U=PE_Goldichite x r_electron= 16.42 barns/cc.

Radioactivity:

GRapi = 158.35 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Goldichite - barely detectable

Goldichite Classification

Dana Class:

29.5.2.1 (29)Hydrated Acid and Sulfates

(29.5)where A B (XO4)2 · x(H2O)

(29.5.2)Dana Group

29.5.2.1 Goldichite KFe(SO4)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VI/C.16-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.16 - Kröhnkite - Goldichite series

VI/C.16-10 Krohnkite Na2Cu(SO4)2·2(H2O) P 2₁/c 2/m

VI/C.16-20 Ferrinatrite Na3Fe(SO4)3·3(H2O) P 3 3

VI/C.16-30 Goldichite KFe(SO4)2·4(H2O) P 2₁/c 2/m

Other Goldichite Information

References:

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

See Also:

Links to other databases for Goldichite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Goldichite

KFe+++(SO4)2·4(H2O)
Dana No: 29.5.2.1 Strunz No: VI/C.16-30
Locality:

Notes: