Gilpinite A Ferroan variety of Johannite	Not a valid mineral species
Uranium
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Property	Data	Remarks
Named for:	Gilpin County in Colorado, USA, where it was first found
Alternate     Name(s):
Mineral Class:
Chemical     Formula:	(Cu,Fe2+)(UO2)2(SO4)2(OH)2 · 6H2O
Chemical     Composition:	Copper: (Cu) 3.402% Hydrogen: (H) 1.511% Iron: (Fe) 2.990% Oxygen: (O) 34.261% Sulfur: (S) 6.865% Uranium: (U) 50.971%	by weight (Copper and Iron both calculated as 1/2 atom)
Molecular     Weight:	933.973	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour × 100 × 10-0     Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System:     Axial Ratios: a:   b:   c:   Cell Dimensions: a:   Å b:   Å c:   Å Z:   a:   ° b:   ° g:   ° V:   Å3 DenCalc:   H-M Symbol:   Space Group:   X-Ray Diffraction:   By Intensity ( I/Io ) (1):   Å (0.0):   Å (0.0):   Å
Habit:
Cleavage:	[001]   [010]   [100]
Fracture:
Moh's Hardness:
Density:		grams/cm3
Color:
Streak:
Luster:
Diaphaneity:
Pleochroism:	(x):   (y:)   (z:)
Ultra Violet     Fluorescence:	Long Wave:   Short Wave:
Magnetism:	Non-magnetic
Occurance:
Associated     Minerals:	Mineral   -   > 50% of sites Mineral   -   > 25% of sites Mineral   -   > 15% of sites Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found with Gilpinite
Localities:	Rare Gilpinite Localities
Notes:	Strongly radioactive a- and b-particles, g-rays. Crystals are probably metamic.