Zippeite

Zippeite is a hydrous potassium uranium sulfate mineral with formula: K4(UO2)6(SO4)3(OH)10·4(H2O). It forms yellow to reddish brown monoclinic-prismatic crystals with perfect cleavage. The typical form is as encrustations and pulverulent earthy masses. It forms as efflorescent encrustations in underground uranium mines. It has a Mohs hardness of 2 and a specific gravity of 3.66. It is strongly fluorescent yellow in UV radiation and is a radioactive mineral.
See more at Wikipedia.org...

General Information:
 Chemical Formula:
K4(UO2)6(SO4)3(OH)10·4(H2O)
 Composition:
(Molecular Weight = 2,306.88 gm)
Potassium 6.78 % K 
Uranium 61.91 % U 
Hydrogen 0.79 % H 
Sulfur 4.17 % S 
Oxygen 26.35 % O 
 Empirical Formula:
K4(UO2)6(SO4)3(OH)10·4(H2O)
 Environment:
Common in underground uranium mines.
 Locality:
Jachymov (St. Joachimsthal), Bohemia, Czech Republic.
 Name Origin:
Named for Franz Xaver Maxmillian Zippe (1791-1863), Austrian mineralogist.
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
yellow, golden yellow, orange red, or reddish brown.
 Density:
3.66
 Diaphaniety:
Transparent to Translucent
 Habits:
Pulverulent - Forms a loose, poorly-coherent powdery mass., Encrustations - Forms crust-like aggregates on matrix.,
 Hardness:
2 - Gypsum
 Luminescence:
Fluorescent and radioactive, Short UV=bright yellow, Long UV=bright yellow.
 Luster:
Earthy (Dull)
 Streak:
yellow white
More details...

General Information:
 Chemical Formula:
(Ni,Co)As3-x
 Composition:
(Molecular Weight = 246.05 gm)
Cobalt 5.99 % Co
Nickel 17.89 % Ni
Arsenic 76.12 % As
 Empirical Formula:
Ni0.75Co0.25As2.5
 Locality:
SI
Physical Properties:
 Color:
gray, tin white, or gray.
 Density:
6.5
 Diaphaniety:
Opaque
 Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Crystalline - Fine - Occurs as well-formed fine sized crystals., Granular - Generally occurs as anhedral to subhe dral crystals in matrix.
 Hardness:
5.5-6 - Knife Blade-Orthoclase
 Luminescence:
Non-fluorescent.
 Luster:
Metallic
More details...

General Information:
 Chemical Formula:
(Na2,Ca)(UO2)2(AsO4)2·5(H2O)
 Composition:
(Molecular Weight = 952.47 gm)
Sodium 3.62 % Na
Calcium 1.05 % Ca
Uranium 49.98 % U 
Arsenic 15.73 % As
Hydrogen 1.06 % H 
Oxygen 28.56 % O 
 Empirical Formula:
Na1.5Ca0.25(UO2)2(AsO4)2·5(H2O)
Physical Properties:
 Color:
green, lemon yellow, or straw yellow.
 Density:
3.846
 Diaphaniety:
Transparent to Translucent
 Hardness:
2.5 - Finger Nail
 Luster:
Vitreous - Pearly
More details...

General Information:
 Chemical Formula:
(Zn,Cu,Fe++)SO4·7(H2O)
 Composition:
(Molecular Weight = 286.05 gm)
Zinc 13.72 % Zn
Iron 1.95 % Fe
Copper 6.66 % Cu
Hydrogen 4.93 % H 
Sulfur 11.21 % S 
Oxygen 61.52 % O 
 Empirical Formula:
Zn0.6Cu0.3Fe2+0.1(SO4)·7(H2O)
Physical Properties:
 Cleavage:
[???] Perfect, [???] Distinct
 Color:
green, yellowish green, or apple green.
 Density:
2.02
 Diaphaniety:
Transparent to Translucent
 Hardness:
2 - Gypsum
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous (Glassy)
More details...

ZIPPEITE