Lonecreekite Mineral Data

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.

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Lonecreekite Crystallography

Cell Dimensions:

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

Crystal System:

Isometric - DiploidalH-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

Diaphaniety:

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

Optical Data:

Isotropic, n=1.483.

Calculated Properties of Lonecreekite

Electron Density:

r_electron=1.78 gm/cc
note: r_Lonecreekite=1.69 gm/cc.

Fermion Index

Fermion Index = 0.03259
Boson Index = 0.96741

Photoelectric:

PE_Lonecreekite= 3.44 barns/electron
U=PE_Lonecreekite x r_electron= 6.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lonecreekite is Not Radioactive

Lonecreekite Classification

Dana Class:

29.5.5.4 (29)Hydrated Acid and Sulfates

(29.5)where A B (XO4)2 · x(H2O)

(29.5.5)Alum Group

29.5.5.1 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

29.5.5.2 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

29.5.5.3 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

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

29.5.5.5 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

Strunz Class:

VI/C.14-40 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.14 - Sodium alum - Zincovoltaite series

VI/C.14-10 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-20 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-30 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-40 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-45 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-50 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

VI/C.14-60 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

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 -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 -École des Mines de Paris

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Lonecreekite

(NH4)(Fe+++,Al)(SO4)2·12(H2O)
Dana No: 29.5.5.4 Strunz No: VI/C.14-40
Locality:

Notes: