Eyselite Mineral Data

General Eyselite Information
Chemical Formula:	Fe+++Ge++++3O7(OH)
Composition:	Molecular Weight = 401.40 gm
	Gallium 0.69 % Ga 0.93 % Ga₂O₃
	Iron 12.94 % Fe 18.50 % Fe₂O₃
	Germanium 53.91 % Ge 77.66 % GeO₂
	Hydrogen 0.29 % H 2.63 % H₂O
	Oxygen 32.17 % O
	______ ______
	100.00 % 99.72 % = TOTAL OXIDE
Empirical Formula:	Fe³⁺_0.93Ga_0.04Ge_2.98O_6.9(OH)_1.17
Environment:	Eyselite was identified in a vug on a single specimen of renierite - germanite ore with minor associated tennantite.
IMA Status:	Approved IMA 2004 (Dana # Added)
Locality:	Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.
Name Origin:	Named for Walter Hans Eysel (1935-1999), Professor of Crystallography at the Ruprecht-Karls-Universit�t, Heidelberg, Germany, for his contributions to the study of germanates.
Synonym:	IMA2003-052