BEAUTIFUL PIECE OF AMETHYST QUARTZ CRYSTAL FROM LA UNION, MURCIA. CRYSTAL OF A BEAUTIFUL COLOR TYPICAL OF AMETHYST. THIS PIECE ESPECIALLY HAS A STRONGER TONE THAN NORMAL. LARGE CRYSTALS IN A DIFFERENT POSITION ON THE MATRIX.
Quartz is the most common mineral, the most abundant that can be found on earth.
It is composed of silicon and oxygen with SiO₂ formula.
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.
