General Information:
Chemical Formula:
(Co,Mg,Ni)Al2(SO4)4·22(H2O)
Composition:
(Molecular Weight = 883.07 gm)
Magnesium 0.83 % Mg
Aluminum 6.11 % Al
Cobalt 4.00 % Co
Nickel 0.66 % Ni
Hydrogen 5.02 % H
Sulfur 14.52 % S
Oxygen 68.85 % O
Empirical Formula:
Co0.6Mg0.3Ni0.1Al2(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
Locality:
On the walls of a shallow open cut 8 miles ESE of Gray Mountain, Coconino County, Arizona USA.
Name Origin:
For the prehistoric pueblo dwelling near the locality.
Physical Properties:
Cleavage:
[012] Distinct
Color:
light pink or pink.
Density:
1.87 - 1.92, Average = 1.89
Diaphaniety:
Transparent
Habits:
Fibrous - Crystals made up of fibers., ,
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Silky
Streak:
white
More details...