A brittle, lamellar to micaceous form of hematite, consisting of tiny flakes.
Also a term applied to goethite from Siegen, Germany.
References for Eisenglimmer
Reference List:
Becher (1789), Min. Beschr. Oranien-Nassau Lande: 401.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 680 (goethite).