When platy materials have a parallel alignment a rock is apex

The rock texture with aligning parallel platy grains is to exhibit metamorphic foliation.

Most metamorphic rocks have a platy or planar structure which is caused by the parallel alignment of micas and/or other flat mineral so this structure is called foliation.

Metamorphic rocks can be foliated or non-foliated.

Foliated metamorphic rocks will display banding or layering of its mineral constituents while non-foliated metamorphic rocks will not.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

density and pressure