SMOKED QUARTZ CRYSTAL ON A SMALL MATRIX. PIECE EXTRACTED IN MASSABE PROVINCE OF GIRONA. VERY GOOD CRYSTAL QUALITY OF GOOD SIZE AND OPAQUE TONE.
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.
