Aventurine

The green quartz or aventurine is a variety of quartz and belongs to the group of oxides, with formula SiO2.

The green quartz owes its color due to the presence of inclusions, generally green mica. The way it appears in nature is totally massive. The genesis of quartz is magmatic, occurring abundantly in acidic magmatic rocks: granites, diorites, quartzites, etc.