Wupatkiite Mineral Data

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.

Name Pronunciation:

Wupatkiite + Pronunciation

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 - Prismatic H-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

Diaphaneity:

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
Ncalc = 1.48 - 1.49

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:

Bulk Density (Electron Density)=1.98 gm/cc
note: Specific Gravity of Wupatkiite =1.90 gm/cc.

Fermion Index:

Fermion Index = 0.0023281526
Boson Index = 0.9976718474

Photoelectric:

PE_Wupatkiite= 2.70 barns/electron
U=PE_Wupatkiite x rElectron Density= 5.34 barns/cc.

Radioactivity:

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

Wupatkiite Classification

Dana Class:

29.07.03.07 (29)Hydrated Acid and Sulfates

(29.07)where A (B)2 (XO4)4 ï¿½ x(H2O)

(29.07.03)Halotrichite Group (Monoclinic with 22 H2O)

29.07.03.01 Pickeringite MgAl2(SO4)4•22(H2O) P 2 2

29.07.03.02 Halotrichite FeAl2(SO4)4•22(H2O) P 2 2

29.07.03.03 Apjohnite MnAl2(SO4)4•22(H2O) P 2₁/c 2/m

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

29.07.03.05 Bilinite FeFe2(SO4)4•22(H2O) P 2₁/c 2/m

29.07.03.06 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4•22(H2O) Mono

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

Strunz Class:

07.CB.85 07 - SULFATES (SELENATES, TELLURATES)

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

07.CB -With only medium-sized cations

07.CB.85 Bilinite FeFe2(SO4)4•22(H2O) P 2₁/c 2/m

07.CB.85 Apjohnite MnAl2(SO4)4•22(H2O) P 2₁/c 2/m

07.CB.85 Dietrichite (Zn,Fe,Mn)Al2(SO4)4•22(H2O) P 2₁/c 2/m

07.CB.85 Halotrichite FeAl2(SO4)4•22(H2O) P 2 2

07.CB.85 Pickeringite MgAl2(SO4)4•22(H2O) P 2 2

07.CB.85 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4•22(H2O) Mono

07.CB.85 Wupatkiite (Co,Mg,Ni)Al2(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 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Wupatkiite

(Co,Mg,Ni)Al2(SO4)4•22(H2O)
Dana No: 29.07.03.07 Strunz No: 07.CB.85
Locality:

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