Wupatkiite Mineral Data

Wupatkiite Mineral Data +

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General Wupatkiite Information

Chemical Formula:

(Co,Mg,Ni)Al2(SO4)4·22(H2O)

Composition:

Molecular Weight = 883.07 gm

Magnesium 0.83 % Mg 1.37 % MgO

Aluminum 6.11 % Al 11.55 % Al₂O₃

Cobalt 4.00 % Co 5.09 % CoO

Nickel 0.66 % Ni 0.85 % NiO

Hydrogen 5.02 % H 44.88 % H₂O

Sulfur 14.52 % S 36.27 % SO₃

Oxygen 68.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Co_0.6Mg_0.3Ni_0.1Al₂(SO₄)₄·22(H₂O)

Environment:

Secondary alteration of primary U-Co-Ni-Mo deposit in the Shinarump member of the upper Chinle Formation.

IMA Status:

Approved IMA 1995

Locality:

On the walls of a shallow open cut 8 miles ESE of Gray Mountain, Coconino County, Arizona USA. Link to MinDat.org Location Data.

Name Origin:

For the prehistoric pueblo dwelling near the locality.

Synonym:

IMA1994-019

Wupatkiite Image

Images:

Wupatkiite

Comments: Pinkish yellow opaque wupatkiite microcrystal in sandstone.
Location: Cameroon, Coconino County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wupatkiite Crystallography

Axial Ratios:

a:b:c =0.2554:1:1.2876

Cell Dimensions:

a = 6.189, b = 24.23, c = 31.2, Z = 6; beta = 100.3333° V = 4,602.85 Den(Calc)= 1.91

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): 4.79(1), 3.494(0.92), 3.768(0.33),

Physical Properties of Wupatkiite

Cleavage:

[012] Distinct

Color:

Light pink, Pink.

Density:

1.87 - 1.92, Average = 1.89

Diaphaniety:

Transparent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Wupatkiite

Gladstone-Dale:

CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2516,KPDmeas= 0.2536,KC= 0.254

Optical Data:

Biaxial (?), a=1.477, g=1.484, bire=0.0070

Pleochroism (x):

pink.

Pleochroism (y):

pink.

Pleochroism (z):

darker pink.

Calculated Properties of Wupatkiite

Electron Density:

r_electron=1.98 gm/cc
note: r_Wupatkiite=1.90 gm/cc.

Fermion Index

Fermion Index = 0.00232
Boson Index = 0.99768

Photoelectric:

PE_Wupatkiite= 2.70 barns/electron
U=PE_Wupatkiite x r_electron= 5.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wupatkiite is Not Radioactive

Wupatkiite Classification

Dana Class:

29.7.3.7 (29)Hydrated Acid and Sulfates

(29.7)where A (B)2 (XO4)4 · x(H2O)

(29.7.3)Halotrichite Group (Monoclinic with 22 H2O)

29.7.3.1 Pickeringite MgAl2(SO4)4·22(H2O) P 2 2

29.7.3.2 Halotrichite FeAl2(SO4)4·22(H2O) P 2 2

29.7.3.3 Apjohnite MnAl2(SO4)4·22(H2O) P 2₁/c 2/m

29.7.3.4 Dietrichite (Zn,Fe,Mn)Al2(SO4)4·22(H2O) P 2₁/c 2/m

29.7.3.5 Bilinite FeFe2(SO4)4·22(H2O) P 2₁/c 2/m

29.7.3.6 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4·22(H2O) Mono

29.7.3.7 Wupatkiite (Co,Mg,Ni)Al2(SO4)4·22(H2O) P 2₁/c 2/m

Strunz Class:

VI/C.12-12 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.12 - Halotrichite group, Pickeringite - Bilinite

VI/C.12-10 Pickeringite MgAl2(SO4)4·22(H2O) P 2 2

VI/C.12-12 Wupatkiite (Co,Mg,Ni)Al2(SO4)4·22(H2O) P 2₁/c 2/m

VI/C.12-20 Halotrichite FeAl2(SO4)4·22(H2O) P 2 2

VI/C.12-30 Apjohnite MnAl2(SO4)4·22(H2O) P 2₁/c 2/m

VI/C.12-40 Dietrichite (Zn,Fe,Mn)Al2(SO4)4·22(H2O) P 2₁/c 2/m

VI/C.12-50 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4·22(H2O) Mono

VI/C.12-60 Bilinite FeFe2(SO4)4·22(H2O) P 2₁/c 2/m

Other Wupatkiite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(Am.Min.,Vol.81,1996)

See Also:

Links to other databases for Wupatkiite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Wupatkiite

(Co,Mg,Ni)Al2(SO4)4·22(H2O)
Dana No: 29.7.3.7 Strunz No: VI/C.12-12
Locality:

Notes: