Goldichite Mineral Data

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)

Environment:

Cementing fragments in slope debris from an oxidizing pyritiferous Colorado Plateau-type uranium deposit.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Dexter No. 7 mine, Calf Mesa, San Rafael district, Emery Co., Utah. Link to MinDat.org Location Data.

Name Origin:

Named for Samuel Stephen Goldich (1909-2000), American mineralogist, petrologist, and analytical isotope chemist, Professor of Geology, University of Minnesota, Minneapolis, Minneso ta, USA

Name Pronunciation:

Goldichite + Pronunciation

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 - Prismatic H-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),

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
Ncalc = 1.59

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:

Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Goldichite =2.43 gm/cc.

Fermion Index:

Fermion Index = 0.0049090482
Boson Index = 0.9950909518

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)
Concentration of Goldichite per GRapi unit = 0.63 (%)

Estimated Radioactivity from Goldichite - barely detectable

Goldichite Classification

Dana Class:

29.05.02.01 (29)Hydrated Acid and Sulfates

(29.05)where A B (XO4)2 ï¿½ x(H2O)

(29.05.02)Dana Group

29.05.02.01 Goldichite KFe(SO4)2•4(H2O) P 2₁/c 2/m

Strunz Class:

07.CC.40 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.40 Goldichite KFe(SO4)2•4(H2O) P 2₁/c 2/m

Other Goldichite Information

References:

NAME( AntBidBlaNic5) 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 - 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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Print or Cut-and-Paste your Goldichite Specimen Label here :

Goldichite

KFe+++(SO4)2•4(H2O)
Dana No: 29.05.02.01 Strunz No: 07.CC.40
Locality:

Notes:

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