section of troctolite showing layered structures
which vary in scale from tens of metres to millimetres.
section, ppl, of troctolite
consisting of plagioclase feldspar (bytownite?).
Coloured minerals are mainly olivine, (fayalite?)
with subordinate clinopyroxene. The opaques are probably chrome-spinel.
section as on left, under crossed polars. The
preferred orientation of the feldspars, due to fractionation from the melt
and settling, is apparent.