sand grains composed of both mono- and polycrystalline quartz; some rare micas (muscovite); former feldspar grains fully weathered and transformed into sericite, now re-arranged as cement between the quartz grains
Texture
coarse-grained; badly sorted; grain size varies from 150 to 3000 microns; maximum grain size 5 mmm
Structure
preferential orientation of phyllosilicates due to cleavage