ROCK CRYSTAL QUARTZ SAMPLE FROM PANASQUEIRA IN PORTUGAL. TOTALLY TRANSPARENT GLASS OF QUALITY AND PERFECT FINISH. MAIN AND TWIN GLASS ON ITS SIDE
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.
