Graeserite Mineral Data

General Graeserite Information
Chemical Formula:	(Fe+++,Ti)4Ti3AsO13(OH)
Composition:	Molecular Weight = 666.95 gm
	Titanium 21.54 % Ti 35.93 % TiO₂
	Iron 33.49 % Fe 47.89 % Fe₂O₃
	Arsenic 11.23 % As 14.83 % As₂O₃
	Hydrogen 0.15 % H 1.35 % H₂O
	Oxygen 33.58 % O
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	Fe³⁺₄Ti₃AsO₁₃(OH)
Environment:	The Fe++ dominant analog of tomichite and the As+++ dominant analog of derbylite. In hydrothermal veins in a two-mica paragneiss.
IMA Status:	Approved IMA 1998 (Dana # Added)
Locality:	Larchelitini, in the Monte Leone Nappe, Binntal region, western Alps, Switzerland. Link to MinDat.org Location Data.
Name Origin:	For Prof. Dr. Stefan Graeser (1935-), in recognition of his extensive research on the oxides and sulfosalts of arsenic in the Binntal region of Switzerland.
Name Pronunciation:	Graeserite + Pronunciation
Synonym:	ICSD 50374
	IMA1996-010