Weathering

Weathering. Stones granodiorides San Lorenzo or Utuado-rock made of:feldspars (plagioclase 30-half, K-feldspars 5-35%)quartz 5-10% or 25-30% in quartz rich granites.The sand in the waterways is made generally out of quartz and feldspars are rare.Most of the others minerals are weathered and their components winds up framing dirt minerals.