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 % K2 O
Iron 15.55 % Fe 22.23 % Fe2 O3
Hydrogen 2.25 % H 20.07 % H2 O
Sulfur 17.86 % S 44.59 % SO3
Oxygen 53.46 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
KFe3+ (SO4 )2 •4(H2 O)
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEGoldichite = 6.70 barns/electronU=PEGoldichite 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 � 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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Goldichite
KFe+++(SO4)2•4(H2O)
Dana No: 29.05.02.01 Strunz No: 07.CC.40
Locality:
Notes:
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