Hematite 4mm Faceted Rondelle - 15-16 Inch Size_4x6-5x8mm It is an aluminum borosilicate

It is an aluminum borosilicate mixed with iron

Smoky Quartz is a translucent smoky brown or gray variety of Quartz

and higher awareness

It is extremely fracture to resistant and has been used for blades and other tools since Neolithic times

Hematite 4mm Faceted Rondelle - 15-16 Inch Size_4x6-5x8mm It is an aluminum borosilicateHematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is black to steel to gray or silver to gray, as well as brown to reddish brown or red in color. Its name is derived from the Greek word for blood, haima, owing to its red appearance when sliced thinly or powdered.