Lonecreekite Mineral Data

General Lonecreekite Information

Chemical Formula:

(NH4)(Fe+++,Al)(SO4)2•12(H2O)

Composition:

Molecular Weight = 474.98 gm

Aluminum 1.42 % Al 2.68 % Al₂O₃

Iron 8.82 % Fe 12.61 % Fe₂O₃

Hydrogen 0.85 % H - % Calc as (NH₄)₂O

Hydrogen 5.09 % H 45.51 % H₂O

Sulfur 13.50 % S 33.71 % SO₃

Nitrogen 2.95 % N 5.48 % (NH₄)₂O

Oxygen 67.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)Fe³⁺_0.75Al_0.25(SO₄)₂•12(H₂O)

IMA Status:

Approved IMA 1983

Locality:

Lone Creek Fall cave, near Sabie, eastern Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Lonecreekite + Pronunciation

Lonecreekite Crystallography

Cell Dimensions:

a = 12.302, Z = 4; V = 1,861.78 Den(Calc)= 1.69

Crystal System:

Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 4.356(1), 7.12(0.7), 3.289(0.65),

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Physical Properties of Lonecreekite

Color:

Colorless.

Density:

1.693

Diaphaneity:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lonecreekite

Gladstone-Dale:

CI meas= -0.099 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.101 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2858,KPDmeas= 0.2853,KC= 0.2597
Ncalc = 1.44

Optical Data:

Isotropic, n=1.483.

Calculated Properties of Lonecreekite

Electron Density:

Bulk Density (Electron Density)=1.78 gm/cc
note: Specific Gravity of Lonecreekite =1.69 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Lonecreekite= 3.44 barns/electron
U=PE_Lonecreekite x rElectron Density= 6.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lonecreekite is Not Radioactive

Lonecreekite Classification

Dana Class:

29.05.05.04 (29)Hydrated Acid and Sulfates

(29.05)where A B (XO4)2 ï¿½ x(H2O)

(29.05.05)Alum Group

29.05.05.01 Alum-(K) KAl(SO4)2•12(H2O) P a3 2/m 3

29.05.05.02 Alum-(Na) NaAl(SO4)2•12(H2O) P a3 2/m 3

29.05.05.03 Tschermigite (NH4)Al(SO4)2•12(H2O) P a3 2/m 3

29.05.05.04 Lonecreekite (NH4)(Fe,Al)(SO4)2•12(H2O) P a3 2/m 3

29.05.05.05 Lanmuchangite! TlAl(SO4)2•12(H2O) P a3 2/m 3

Strunz Class:

07.CC.20 07 - SULFATES (SELENATES, TELLURATES)

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

07.CC -With medium-sized and large cations

07.CC.20 Lonecreekite (NH4)(Fe,Al)(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Alum-(K) KAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Alum-(Na) NaAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Lanmuchangite! TlAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Tschermigite (NH4)Al(SO4)2•12(H2O) P a3 2/m 3

Other Lonecreekite Information

References:

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

See Also:

Links to other databases for Lonecreekite :
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

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Lonecreekite

(NH4)(Fe+++,Al)(SO4)2•12(H2O)
Dana No: 29.05.05.04 Strunz No: 07.CC.20
Locality:

Notes:

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