Abstract
In minerology, garnet group is composed by six silicate minerals, with general chemical formula X3Y2Si3O12. This group is usually subdivided into two subgroups, the first one called piralspites characterized by the fact the cation Y=Al, the second one called ugrandine has necessarity X=Ca. The first member of ugrandite subgroup being the grossular with formula Ca3Al2Si3O12, can be one of …