As derb brownish red masses and coarse aggregates. Streak Gray, white to brown. Luster Vitreous or resinous. Associates Blue vivianite on the surface. Notes Often with black tarnish on the surface.
Some localities exists in Sweden.
Norr mica quarry, Nyn shamn. As resinous aggregates together with triphylit. Lilla lgsj brottet, Kolmorden. As up to 10 cm big lumps, commonly. As dark brown derb lumps, often covered in blue vivianite Varutr sk , V sterbotten.