LOT OF 54 UNITS OF AMETHYST QUARTZ ON MATRIX FROM BRAZIL. PREMIUM QUALITY GLASSES PRESENTED IN 4X4 BOXES
Quartz is the most common mineral, the most abundant that can be found on earth.
It is composed of silicon and oxygen with the formula SiO₂.
According to the Nickel-Strunz classification, quartz belongs to the class of oxides, while in the Dana classification, it is considered a tectosilicate.
There are multiple varieties of quartz, colors and types.
