Microphotography in plane polarised light, of a metapelite with quartz (Q), muscovite (musc), biotite (biot), garnet (Gt : grey) and 2 automorphic crystals automorphes (sub-hexagonal sections) of staurolite (Std: light yellow). (The short side of the photo is around 1 mm).
Under crossed-polarised light, the two crystals of staurolite have low polarisation colours (grey of 1st order ). The isotropic garnet is black. The quartz is white to black. The micas are brightly coloured..
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