Pseudojohannite Mineral Data

General Pseudojohannite Information
Chemical Formula:	Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O
Composition:	Molecular Weight = 3,587.89 gm
	Uranium 52.08 % U
	Copper 11.55 % Cu
	Hydrogen 1.57 % H
	Sulfur 3.59 % S
	Oxygen 31.21 % O
	______
	100.00 %
Empirical Formula:	Cu_6.52U_7.85S_4.02O₇₀H_55.74
Environment:	Peudojohannite and other divalent zippeites are common, easily overlooked minerals in acid drainage environments around uranium deposits and wastes.
IMA Status:	Approved IMA 2000 (Dana # Added)
Locality:	J�chymov (St. Joachimsthal), Northern Bohemia, Czech Republic. Link to MinDat.org Location Data.
Name Origin:	Named for the (almost) relationship by composition with johannite.
Synonym:	IMA2000-019