Biotite (Var: Titanium-bearing Biotite), Forsterite, Spinel, Ilmenite
Kaltes valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
Thin section view in PPL (plane-polarized light) showing abundant titanian biotite (in brilliant pleochroic shades of copper-red, orange, yellow and tan), forsterite (~Fo90; colorless), scattered spinel (medium gray), and minor ilmenite (opaque). Original image was taken with Kodachrome 64 slide film. Magnification = 25X; field of view is ...
© Frank K. Mazdab