The school’s museum majestically showcases an outstanding collection of 20,000 samples of 3,000 different types of minerals , gemstones , crystals and , of course , ouro prêto , black gold .
The school’s museum majestically showcases an outstanding collection of 20,000 samples of 3,000 different types of minerals , gemstones , crystals and , of course , ouro preto , black gold .